If you’re searching for the best dental floss right now, chances are you’ve heard about the PFAS controversy around PTFE-based flosses like Oral-B Glide. You’re not alone: it’s the single biggest topic driving floss conversations on Reddit’s dental communities. We’ll address it head-on below.
But here’s the thing hygienists keep saying in those same forums: the type of floss matters more than most people think. Their working view is that thicker, textured, or expanding flosses grab more plaque per pass than thin, smooth ones. The published evidence is more cautious than the forums. The ADA’s floss page says there is no effectiveness difference between waxed and unwaxed floss and that “it’s generally not what type of floss is used, but how and when it’s used,” and a 2019 Cochrane review of 35 trials found only low-certainty evidence that flossing on top of brushing reduces gingivitis, with interdental brushes possibly doing better than floss. So read the picks below as “which floss will you use every day,” not “which floss is clinically superior.” The ADA still recommends cleaning between your teeth once a day, and the best floss is the one you’ll actually use.
How we researched this page: We reviewed ADA guidance and the 2019 Cochrane review on interdental cleaning, cross-referenced Reddit discussions across r/dentistry, r/askdentists, r/DentalHygiene, and r/nontoxic (where PFAS concerns are heavily discussed), and analyzed community consensus data from our 1,400+ thread dental research corpus. We did not test these products hands-on. Our recommendations are based on ingredient evidence, professional commentary, and real user experience patterns, not personal use.
Oral-B Glide Scope Outlast Dental Floss (6-Pack) — Best Overall
Oral-B Glide Scope Outlast Dental Floss (6-Pack)
Best for: Most adults who want smooth, shred-resistant floss that slides easily between tight teeth
- Ultra-smooth texture that resists shredding (historically PTFE; the current polymer is not disclosed)
- Slides easily between tight contacts and dental work
- Light wax coating for comfortable glide
- Available in multiple lengths and flavor options
- +Ultra-smooth PTFE texture slides between the tightest contacts without shredding
- +Thin profile suits crowns, veneers, and dental work where a non-catching floss won't dislodge restorations
- +Six 40-metre spools per pack works out to roughly 6 cents a yard, the lowest per-yard cost on this page
- −PTFE/PFAS history: in a 2019 study of 178 women, Glide users had higher blood levels of the PFAS chemical PFHxS; ingredient transparency is limited
- −Hygienists on Reddit say smooth, thin floss removes less plaque than thicker, textured alternatives
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Why We Recommend It
The listing we link is the Scope Outlast mint version in a six-spool value pack (about $16 for 240 metres, roughly 6 cents a yard), which is why it holds the top slot for most adults: it slides between even the tightest contacts without shredding, it is cheap enough to use generously, and the 7,000-plus Amazon ratings sit at 4.5 stars. Oral-B has been reformulating Glide to move away from PTFE (the material linked to PFAS concerns), and the newer versions use a different polymer. Long-time users report the texture feels rougher and more plastic-like than the original, though a hygienist on r/DentalHygiene notes the new version “actually cleans better” because it grips the tooth surface more.
Key Features
- Ultra-smooth texture that resists shredding (historically PTFE; Oral-B has been reformulating and the current polymer is not disclosed)
- Slides easily between tight contacts and dental work
- Light wax coating for comfortable glide
- Available in multiple lengths and flavor options
- Thin profile fits comfortably in narrow spaces
Who It’s Best For
Oral-B Glide is an excellent everyday floss for most adults, and it’s especially well-suited for people with tight contacts who struggle with thicker flosses that shred or get stuck. It’s also a good choice for anyone with crowns, veneers, or other dental work where a smooth, non-catching floss reduces the risk of dislodging restorations. If you’re also considering upgrading your interdental routine, our best water flosser picks pair well with string floss for a more thorough clean.
Potential Downsides
Glide’s PTFE/PFAS history is the elephant in the room. The original formula used PTFE (a Teflon-type polymer), and a 2019 study in the Journal of Exposure Science & Environmental Epidemiology found higher blood levels of one PFAS chemical, PFHxS, in the women who reported flossing with Oral-B Glide. The same researchers screened 18 flosses for fluorine and detected it in six: all three Glide varieties, two store brands labeled “compare to Oral-B Glide,” and one floss sold as a single-strand Teflon fiber. The other 12 showed no fluorine; the screen detected presence, not amount. Oral-B has been reformulating, but ingredient transparency has been limited: consumers can’t easily verify what polymer the current version uses. If you want to avoid PTFE entirely, see Davids Expanding Floss below: it’s labeled PTFE- and PFAS-free, vegan, and uses nano-hydroxyapatite instead of synthetic coatings. Beyond the materials question, dental professionals on Reddit consistently note that smooth, thin floss like Glide is less effective at plaque removal than thicker, textured alternatives: “We do NOT like glide,” writes one dental professional on r/nontoxic. “Thicker/fluffier floss is more effective than thin slippy floss.”
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Cocofloss Coconut-Oil Infused Dental Floss — Best Textured
Cocofloss Coconut-Oil Infused Dental Floss
Best for: People who want maximum plaque removal and a premium flossing experience
- 500+ interwoven microfilaments that expand to scrub tooth surfaces
- Infused with coconut oil and natural fruit waxes
- Textured design built to grip more plaque than smooth floss
- Available in several pleasant flavor options
- +One of the expanding flosses hygienists name most often, alongside GUM expanding floss and Dr. Tung's, with the caveat that some clinicians find it too wide
- +500+ interwoven microfilaments expand to physically scrub plaque rather than slide past it
- +One user credited a routine that included Cocofloss with taking periodontal pockets from 6-7mm to 3-4mm
- −Premium price: around $10 per spool, far more than conventional floss
- −Thick, textured profile may not fit very tight contacts and isn't ideal for patients with many restorations
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Why We Recommend It
Cocofloss is one of the expanding flosses hygienists on r/DentalHygiene name most often (alongside GUM expanding floss and Dr. Tung’s), and an RDH’s patient recommendation sheet posted on that subreddit includes it. It is not unanimous, which we cover in the downsides below. The floss is made from hundreds of interwoven microfilaments that fan out when pressed against the tooth surface, physically scrubbing away plaque rather than just sliding past it. One user on r/PeriodontalDisease credited Cocofloss as part of the routine that took their periodontal pockets from 6-7mm to 3-4mm. If you look at the floss after use, you’ll likely see visible debris—a satisfying (if slightly unsettling) sign that it’s working.
Key Features
- 500+ interwoven microfilaments that expand to scrub tooth surfaces
- Infused with coconut oil and natural fruit waxes
- Textured design built to grip more plaque than smooth floss
- Available in several pleasant flavors including coconut, strawberry, and mint
- Vegan and cruelty-free
Who It’s Best For
Cocofloss is ideal for anyone who wants the most thorough clean possible from string floss and doesn’t mind paying a premium for it. It’s particularly effective for people who tend to build up plaque quickly or who have been told by their hygienist that they need to improve their flossing game. It’s also a solid choice for anyone who wants a more “natural” feeling floss experience with coconut oil and plant-based ingredients.
Potential Downsides
The biggest barrier is price: at around $10 for a roughly 33-yard spool, Cocofloss costs significantly more per yard than conventional floss, and a dedicated r/DentalHygiene thread asks “Is there a floss similar to cocofloss that doesn’t cost an arm and a leg?” Its thicker, textured profile may not fit comfortably between very tight contacts, and a hygienist notes it doesn’t work well for patients with lots of restorations. One concern surfaced by r/moderatelygranolamoms: Cocofloss contains polyester (a microplastic), which matters to environmentally conscious buyers. The clinician pushback is louder than the May version of this page allowed: in a 45-point r/Dentistry thread, two of the top comments are practitioners saying “it’s too wide for my own teeth” and that it is “sooo hard to floss between patients’ teeth with it,” and a 27-point r/BeautyBoxes thread is mostly shredding reports. Cocofloss has since shipped a thinner version. If you have crowded teeth or a lot of fillings, a thinner floss like Oral-B Glide is the more practical daily choice.
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Dr. Tung’s Smart Floss — Best Expanding
Dr. Tung's Smart Floss
Best for: People with wider or uneven gaps who want floss that adapts to different spaces
- Expands and stretches to clean more surface area than standard floss
- Adapts to varying gap sizes throughout the mouth
- Infused with natural cardamom and lemon essential oils
- Soft, comfortable texture that's gentle on gums
- +Expanding design starts thin then widens in larger gaps, adapting to varying spacing
- +Recommended by name by hygienists on Reddit, listed alongside Cocofloss as a primary pick
- +Adapts to varying gap sizes, so it suits mouths with wide or uneven spacing
- −Not the thinnest floss, so harder to start between very tight contacts than a slim PTFE option
- −Distinctive cardamom flavor isn't to everyone's taste
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Why We Recommend It
Dr. Tung’s Smart Floss solves a common frustration: the fact that gaps between your teeth aren’t all the same size. Its expanding design starts thin enough to slip between tight contacts and then stretches wider in larger gaps, adapting as it goes. The manufacturer cites a study showing Smart Floss removes up to 55% more plaque than regular floss—we haven’t independently verified this figure, but the expanding mechanism is genuine and dental hygienists on r/DentalHygiene and r/nontoxic recommend it by name. A dental professional on r/nontoxic lists it alongside Cocofloss as their primary floss recommendation.
Key Features
- Expands and stretches to clean more surface area than standard floss
- Adapts to varying gap sizes throughout the mouth
- Infused with natural cardamom and lemon essential oils
- Soft, comfortable texture that’s gentle on gums
- Free from artificial flavors and colors
Who It’s Best For
Smart Floss is a standout choice for anyone whose spacing varies significantly throughout the mouth, including wide gaps left by extractions. It is not the pick for bridges, implants or a mouth full of crowns: hygienists in our research name expanding floss as the type that catches on restoration margins, and a bridge needs super floss or a threader rather than any spool (see the crowns section below). It’s also great for people who find standard floss too thin to feel like it’s doing anything in their wider gaps. If you’re dealing with plaque buildup around dental work, our guide on how to remove plaque from teeth offers additional strategies beyond flossing.
Potential Downsides
The expanding design means it’s not the thinnest floss available: if all your contacts are very tight, you may find it harder to get started between teeth compared to a slim PTFE floss. Some users also note that the cardamom flavor is distinctive and not to everyone’s taste. The spool packaging is functional but less elegant than some competitors.
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REACH Gentle Gum Care Floss (formerly Listerine) — Best for Sensitive Gums
REACH Gentle Gum Care Floss
Best for: People with sensitive or bleeding gums who find regular floss too harsh
- Woven expanding floss with a soft, non-waxed feel made for tender gums
- Slides gently without cutting or snapping
- Cinnamon mint flavor for freshness without irritation
- Effective plaque removal despite gentle construction
- +Cushioned, softer-than-average texture is gentler on tender, bleeding, or inflamed gums
- +Slides gently without cutting or snapping, making a consistent habit easier to maintain
- +A good transitional floss for easing back into a routine after a hiatus
- −Softer construction is less durable and can shred between very tight contacts
- −Gentler than aggressive textured options like Cocofloss, which is the point, but it will not scrub as hard
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Why We Recommend It
For anyone who has ever avoided flossing because it hurts or causes bleeding, Gentle Gum Care is designed specifically to solve that problem. Long sold under the Listerine name, this floss now ships under the REACH brand: it’s the same Amazon listing and the same expanding woven design, with the name on the box the visible change. Its cushioned, softer-than-average texture is noticeably gentler on gum tissue than standard nylon floss, making it easier to build and maintain a consistent flossing habit. The ADA’s flossing guidance says cleaning between your teeth shouldn’t hurt: too hard damages the tissue, too gentle leaves plaque behind, and if it still hurts once you’ve settled into a routine, talk to your dentist. A softer floss makes that balance easier to find. One honest note: the current listing specifies non-waxed, so don’t expect Glide-style slip.
Key Features
- Woven expanding floss with a soft, non-waxed feel made for tender gums (listing: silica powder and a toothpaste-ingredient coating, vitamin E)
- Slides gently without cutting or snapping against gum tissue
- Cinnamon mint flavor for freshness without irritation
- Effective plaque removal despite gentle construction
- Sold as a three-pack of 55-yard spools (about $19)
Who It’s Best For
This floss is purpose-built for people with sensitive, inflamed, or bleeding gums: whether that’s due to early-stage gum disease, recent dental procedures, or simply having delicate tissue. It’s also a good transitional floss for people who are getting back into a flossing routine after a long hiatus and want to ease in gently. For those managing gum sensitivity across their entire routine, pairing this with a sensitivity-focused mouthwash can provide additional comfort.
Potential Downsides
The softer woven construction means it may not be as durable as tougher flosses: it can shred more easily between very tight contacts, and because it is non-waxed it does not slip into a tight contact the way Glide does. It also does not scrub as aggressively as Cocofloss. About 1,000 Amazon ratings at 4.4 stars is small for a drugstore brand, and the back story explains why: the Listerine Gentle Gum Care woven floss was discontinued around 2020 (a r/Invisalign thread tracks users mourning it for four years), then reappeared under the REACH name in early 2026. The old version had devotees (one r/Dentistry commenter called it “the only thing I use now” back in 2016), but the one returning user we found who tried the relaunch says “I don’t think it’s the same. It seems to shed bits easily.” If you loved the original, buy one pack before you buy three.
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Davids Expanding Dental Floss — Best Natural
Davids Expanding Dental Floss
Best for: Eco-conscious buyers who want an expanding floss labeled PFAS-free, with nano-hydroxyapatite
- Woven multifilament expanding design — starts thin, widens in gaps
- Coated with nano-hydroxyapatite, cocoa butter, and mint essential oils
- PTFE-free and PFAS-free per the published ingredient list, vegan, and free from artificial ingredients
- Refillable dispenser — buy refill spools instead of new containers
- +Expanding multifilament design cleans wider gaps effectively
- +Nano-hydroxyapatite coating for added enamel support while flossing
- +Refillable dispenser reduces plastic waste
- −Can shred if pulled too tightly over tight contacts
- −Smallest review base on this page (a few hundred ratings on the refill listing) and the dispenser is sold separately
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Why We Recommend It
Davids brings the same clean-ingredient philosophy that made their nHAP toothpaste a Reddit favorite to the floss category. This is a woven multifilament floss that expands between teeth, similar in concept to Dr. Tung’s Smart Floss, but with a few distinct advantages: nano-hydroxyapatite coating for enamel support, a refillable dispenser that cuts plastic waste, and a cocoa butter + mint flavor that reviewers describe as “silky” rather than medicinal. At around $9 for two 33-yard refill spools, it’s priced between budget nylon and premium Cocofloss. Amazon reviewers specifically compare it favorably to Dr. Tung’s: “a great expanding floss option” that’s “more budget-friendly, refillable, and without the cardamom flavour.” The dental professional on r/nontoxic whose anti-Glide comment we quote above gives Davids an “honorable mention” after Cocofloss, Dr. Tung’s and silk/bamboo floss, and a tight-contacts user on r/Dentists found it “more comfortable” than Cocofloss’s thin version. No shredding or flavor complaints turned up in the Reddit threads we read, though Amazon reviewers do report shredding at tight contacts (see below).
Key Features
- Woven multifilament expanding design that adapts to varying gap sizes
- Coated with nano-hydroxyapatite, cocoa butter, and peppermint/spearmint essential oils
- PTFE-free and PFAS-free per Davids’ published ingredient list, and vegan
- Refillable dispenser reduces single-use plastic
- 250+ strand construction resists breaking
Who It’s Best For
Davids floss is the pick for buyers who want clean, transparent ingredients AND an expanding texture that actually cleans, not just a feel-good label on a mediocre floss. It’s particularly good for people who like Dr. Tung’s expanding concept but want a milder mint flavor, a lower price per yard, or a refillable container. If you’re already using Davids nHAP toothpaste, this extends the same ingredient approach to your whole flossing routine. It’s the best option here for buyers prioritising refillability and a clean ingredient list, with the polyester caveat below.
Potential Downsides
The listing we link is the two-spool refill pack, which carries a few hundred Amazon ratings (4.8 stars), so it has the thinnest track record on this page, and the dispenser is sold separately: the refill spools work on their own, but the pop-open container the brand is known for is a second purchase. Multiple reviewers note it can shred between very tight contacts if pulled too aggressively, though this is common with expanding flosses. The refillable dispenser has mixed feedback: some users report the lid doesn’t hold up well after multiple refills. And the expanding texture, while great for moderate-to-wide gaps, isn’t as thin as Oral-B Glide for the tightest contacts. One more honest note for the zero-waste crowd who find this brand first: the floss strand itself is polyester, the same microplastic objection r/PlasticFreeLiving raises against Cocofloss. “PFAS-free” and “plastic-free” are different claims, and Davids makes only the first.
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Reach Dentotape Waxed Dental Floss — Best Value
Reach Dentotape Waxed Dental Floss
Best for: Budget shoppers and people with wider gaps who prefer a flat, ribbon-style floss
- Extra-wide waxed tape design for broader surface coverage
- Flat ribbon shape covers more tooth surface per pass
- Waxed for smooth glide between teeth
- Six 100-yard spools per pack, about 7 cents a yard
- +Flat, ribbon-style tape covers more surface area per pass, good for wider gaps and bridges
- +Six 100-yard spools for about $42 works out to roughly 7 cents a yard, a fraction of premium woven floss
- +Solid value for families who go through floss quickly
- −Wide tape profile can bunch up or be hard to thread between very tight contacts
- −Lacks the premium feel and features of pricier options
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Why We Recommend It
Reach Dentotape has been on drugstore shelves for decades, and it keeps a loyal following for a simple reason: it works and it is cheap per yard. The listing we link is a six-pack of 100-yard spools for about $42, which sounds like a lot until you do the arithmetic: roughly 7 cents a yard, against about 30 cents a yard for Cocofloss. The flat, ribbon-style tape covers more surface area per pass than round floss, which can make cleaning feel more thorough, particularly for people with wider interdental spaces. Its 8,600-plus Amazon ratings at 4.6 stars are the second-largest review base on this page.
Key Features
- Extra-wide waxed tape design for broader surface coverage
- Flat ribbon shape covers more tooth surface per pass
- Waxed for smooth glide between teeth
- Six 100-yard spools per pack, about 7 cents a yard
- Unflavored and mint options available
Who It’s Best For
Dentotape is the per-yard bargain of this lineup for people who floss daily and go through a lot of it; the six-pack is a bigger upfront spend than a single spool, so it suits households rather than someone trying tape for the first time. The flat tape design is particularly well-suited for people with wider gaps, bridges, or areas where round floss feels inadequate. It’s also a good option for families who go through floss quickly and want value without sacrificing effectiveness. For a head-to-head comparison of flossing methods, check our guide on water flosser vs. floss.
Potential Downsides
The wider tape profile can be a challenge in very tight contacts: it may bunch up or feel difficult to thread between closely spaced teeth. It lacks the premium feel and features of pricier options, and the packaging is purely functional. If you have tight teeth and limited dexterity, a thinner floss or a floss pick may be easier to work with.
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Buyer’s Guide: What to Look For
Waxed vs. Unwaxed
Waxed floss has a light coating that helps it slide between tight contacts more easily, while unwaxed floss may grip tooth surfaces slightly better. The ADA states that both are effective when used properly. Most people find waxed floss easier and more comfortable to use, which is why the majority of our picks feature some form of wax coating.
PTFE (Glide-Type) vs. Nylon
PTFE-based flosses (like Oral-B Glide) offer the smoothest possible glide and virtually never shred, which can improve daily compliance for people with tight contacts. Nylon flosses are more traditional, widely available, and sidestep the PTFE question entirely: it’s the polymer that carries the PFAS concern, not the brand on the box. If ease of use is your priority, PTFE wins. If ingredient transparency matters more, nylon with natural wax is the way to go.
Expanding vs. Standard
Expanding flosses like Dr. Tung’s Smart Floss start thin and widen as they’re pressed against tooth surfaces, adapting to different gap sizes. Standard flosses maintain a consistent thickness. Expanding floss is particularly useful if your teeth have varying spacing or if you have dental work that creates non-uniform gaps.
Textured vs. Smooth
Textured flosses (like Cocofloss) have a rougher surface that may grab more plaque per pass but require more effort to thread. Smooth flosses glide effortlessly but may leave behind more residue. Consider how tight your contacts are: texture is great for accessible gaps but can be impractical in very tight spaces.
Flavor and Comfort
Floss comes in mint, cinnamon, coconut, unflavored, and more. Flavor doesn’t affect cleaning performance, but it can affect whether you enjoy the experience enough to do it every day. The best floss is the one you’ll actually use, so pick a flavor and texture that doesn’t feel like a chore.
How Much Should You Spend?
Single spools typically run $5 to $10; multipacks bring the per-yard cost down sharply (see the per-yard figures above). Premium options like Cocofloss run higher but offer a different cleaning experience. There’s no evidence that expensive floss is categorically more effective than affordable floss: technique and consistency matter far more than price point.
Which Floss for Crowns, Bridges and Implants?
This is a question our Google visitors keep asking that the page never answered, so here is the professional view from the 53 Reddit threads we read for this update (18 dental hygienists, 14 of them with subreddit flair, plus three general dentists and an orthodontist). It comes in three parts, and none of them is “buy a special floss.”
First, if floss shreds or catches on a crown, that is a signal, not a product complaint. “A crown should not be catching or shredding floss,” writes a commenter on r/Dentistry. “If there is then it’s one of three things: excess cement, open margin, too tight of contacts.” A general dentist on the same subreddit puts the standard plainly: “closed contacts that allow floss to ‘snap’ through with gentle pressure; you paid for your crown and deserve that standard.” Before changing brands, get the crown checked.
Second, anything with a span you cannot floss straight down into (a bridge, an implant bar, an All-on-4 arch) needs super floss or a floss threader, not a different spool. An orthodontist’s advice: “Superfloss can be a good option, but if it is really tight you’ll need to use a floss threader, since it is more robust.” All-on-4 and implant-bar patients in these threads report the stiff end of super floss bending rather than threading; one bridge patient got under the span only after switching to a plain threader. The stakes are real: a commenter on r/DentalHygiene puts it bluntly: if you cannot clean under a bridge, “your abutment teeth will start to decay and you won’t know until they snap off.” Water flossers show up as a helper in these threads, never as the dentist-endorsed replacement for getting under the span.
Third, thick woven and expanding floss is the repeat offender on restoration margins. “I’m a dental hygienist that’s had a lot of dental work done over the years,” one writes. “The expanding floss that’s woven catches on all my filling and crown margins. Then it shreds.” Another hygienist tried Cocofloss on patients: “if you do [have fillings or crowns] it will definitely catch and shred.” For a mouth with a lot of dental work, the smooth, thin pick on this page (Glide) is the one professionals reach for, and the expanding picks (Dr. Tung’s, Davids, Cocofloss) are the ones to test carefully before committing. One caution worth repeating from a r/Dentists thread: a patient pulled a crown off while flossing. “Be gentle if it’s not gliding smooth and pull it through the side instead of up and down.”
Floss for Tight Teeth
Here the hygienist consensus runs the opposite way from the “thicker cleans better” rule above, and the professionals say so themselves. The floss they name first for tight contacts is not an expanding one: it is a thin, slightly stretchy tape with a light texture. “For tight teeth, I recommend listerine/reach ultra clean floss,” writes a hygienist in a 13-point r/DentalHygiene comment. “It is flat and ‘stretchy’ but has microscopic crystals that create a rough texture to disrupt more plaque.” Another: “It’s thin like Glide and a little stretchy so it gets into tight contacts, but it has some texture to it so it gets more plaque than Glide. If it’s going to break it usually just snaps in two pieces instead” of shredding. Confusingly, the Gentle Gum Care listing above now carries “REACH Ultraclean” on the box, but that is the woven expanding floss, not the flat stretchy Ultraclean tape hygienists mean here. We have not placed the tape yet; it is the single most-recommended floss by hygienists in the threads we read, and it is on our list to evaluate.
From our lineup, Glide is the fallback hygienists still name for contacts nothing else will pass: “Oral-B Glide. It’s tape and it’s strong. We use it all the time at my office.” The expanding flosses are the ones to avoid here. “If you have trouble with shredding floss you should steer clear of expanding floss like Dr. Tung’s Smart Floss,” one hygienist writes, and a patient with tight teeth says “none of the expanding type floss are even possible for me to use.” One exception we banked: a tight-contacts user who found Davids “more comfortable” than Cocofloss’s new thin version, so the woven picks are not a guaranteed no.
Three technique notes from these threads, two of them from clinicians, because most tight-teeth frustration is technique:
- Wrap, don’t pinch. Wind the floss around your middle fingers and leave your index fingers free to push it toward the back of the mouth; pinching with the index fingers shortens your reach and forces a snap.
- Pull it out sideways. When floss gets stuck, do not yank it back up through the contact. Let go of one end and pull it through toward your cheek. Commenters on r/Dentistry add that floss which shreds in the same molar spot every time may be catching on a cavity edge, a sharp piece of tartar, or a filling overhang, all of which your dentist can fix.
- Hold expanding floss taut on entry. “If you wrap it tight and hold it taut between your fingers, it becomes thin to get between the teeth and then expands when it’s in.” It is the technique that gives the woven picks on this page a chance at a tight contact.
Community vs. Evidence: What Dental Professionals Actually Recommend
| Community sentiment | Professional commentary | |
|---|---|---|
| Thin, smooth floss (Glide-type) | Most popular — consumers default to it for comfort | Professionals often prefer thicker alternatives for normal-to-open contacts: “thicker/fluffier floss is more effective than thin slippy floss” |
| Textured/expanding floss | Enthusiastic niche following, price is the main objection | Hygienists name Cocofloss, Dr. Tung’s and GUM expanding floss, though for tight contacts and restorations they steer patients the other way |
| PFAS/PTFE concerns | High anxiety — the #1 topic driving floss switching on Reddit | Legitimate concern per published research: fluorine detected in 6 of 18 flosses tested, and Glide use tracked with higher blood PFHxS. How much reaches the body in normal use is unknown |
| Floss type matters | Most consumers assume “floss is floss” | Hygienists on Reddit say type matters: expanding and textured flosses grab more plaque per pass. The ADA’s published position is the opposite emphasis: technique and consistency over floss type |
The professional view splits by mouth: thicker floss if your contacts allow it, a thin textured tape if they don’t. Either way, a floss used daily beats a better floss sitting in the drawer.
Evidence Receipt
- Flossing on top of brushing has modest, low-certainty evidence behind it. The 2019 Cochrane review (35 trials, 3,929 adults) found low-certainty evidence that floss plus brushing may reduce gingivitis at one, three and six months, inconsistent results for plaque, and no trials long enough to measure cavities between teeth. Interdental brushes may reduce gingivitis more than floss.
- The ADA does not rank floss types. Its floss and interdental cleaners page states there is no difference in effectiveness between waxed and unwaxed floss, recommends cleaning between teeth once a day, and says brushing before or after flossing are both acceptable.
- Technique is specified, not improvised. The ADA’s consumer guidance (MouthHealthy) gives the 18-inch, C-shape, below-the-gumline method we describe in the FAQ.
- The PFAS link to Glide is an association in one study, not a measured dose. Boronow et al., 2019 (178 women) found higher serum PFHxS in those who reported flossing with Oral-B Glide; the companion Silent Spring Institute release reports fluorine detected in 6 of 18 flosses screened, including all three Glide products tested. The screen shows presence, not amount transferred in use.
- Ratings and prices are live Amazon US reads, not manufacturer claims. Every star rating and review count on this page was read from the linked US listing on the page’s last update date shown in the disclosure above; the “55% more plaque” figure Dr. Tung’s cites is the manufacturer’s own and we have not verified it.
When Flossing Doesn’t Seem to Help
Flossing every day but still getting cavities between teeth or worsening gum pockets? The issue is often one of these patterns:
- Technique matters more than product. If you’re snapping floss straight down and back up, you’re missing the contact surface. Curve the floss into a C-shape against each tooth and slide it below the gumline; the ADA’s flossing technique guide covers the full method. Many people floss for years with poor technique and blame the floss.
- Floss alone doesn’t reach everything. If you have wider gaps, dental work, or periodontal pockets, string floss may not be enough. Interdental brushes clean wider spaces more effectively, and water flossers flush debris from below the gumline where string floss can’t reach. Dental communities on Reddit consistently recommend combining tools, not choosing one.
- Gum disease needs more than flossing. If your gums bleed persistently despite consistent flossing, that’s a signal to see your dentist, not to floss harder. Periodontal disease requires professional treatment (scaling, root planing) that home care alone can’t replace. See our gum disease toothpaste guide for the full home-care picture.
- You’re flossing at the wrong time. Flossing before brushing lets fluoride from your toothpaste reach between freshly cleaned teeth. Some dental professionals prefer this sequence, though the ADA says either order is acceptable.
FAQ
Q: How often should I floss? A: The ADA recommends cleaning between your teeth once a day with an interdental cleaner. Whether you floss in the morning or at night matters less than doing it consistently. Many dentists suggest flossing before brushing so that fluoride from toothpaste can reach between freshly cleaned teeth.
Q: Is PTFE floss safe to use? A: The evidence is real but thin. In the 2019 study cited above, fluorine was detected in six of the 18 flosses screened, including all three Glide varieties, and the women who reported flossing with Glide had higher blood PFHxS. What the study could not show is how much of that fluorine transfers during normal use, and the researchers confirmed fluorine is present in the floss, not how much reaches you in use. The practical answer: don’t stop flossing over it, and if the question bothers you, pick a floss with no PTFE on its ingredient list, such as Davids Expanding Floss or Dr. Tung’s Smart Floss. Consult your dentist or doctor if you have specific health concerns.
Q: Should I use dental floss or a water flosser? A: Both are effective interdental cleaning methods, and the ADA recognizes both as valid options. String floss excels at scraping plaque off tooth surfaces through direct contact, while water flossers use pressurized water to flush debris from gaps and along the gumline. Many dental professionals suggest using both for the most thorough clean. For a detailed comparison, see our water flosser vs. floss guide.
Q: My gums bleed when I floss. Should I stop? A: Mild bleeding when you first start (or restart) a flossing habit is common and often settles as your gums adapt to the routine. However, persistent bleeding may be a sign of gingivitis or gum disease and should be discussed with your dentist. In the meantime, switching to a gentler floss like REACH Gentle Gum Care (sold as Listerine Gentle Gum Care before the line’s rebrand) can make the experience more comfortable while your gums adapt.
Q: What’s the correct flossing technique? A: The ADA recommends using about 18 inches of floss, winding most of it around your middle fingers and taking up the used floss as you go. Gently guide the floss between teeth using a rubbing motion: never snap it into the gums. Curve the floss into a C-shape against each tooth surface and slide it up and down beneath the gumline. Use a clean section of floss for each tooth.
Q: What’s the best floss for crowns and bridges? A: For a single crown, any floss that passes through cleanly is fine; if floss catches or shreds on a crown, dentists on r/Dentistry say that points to excess cement, an open margin, or an over-tight contact, so book a check rather than switch brands. For a bridge or implant bar you need super floss or a floss threader to get under the span, and thick woven or expanding floss is the type hygienists report catching on filling and crown margins, so the smooth picks here (Glide, Dentotape) are the safer default for a mouth with a lot of dental work. Full detail in the crowns section above.
Q: What floss works best for tight teeth? A: Hygienists in the threads we read name a thin, slightly stretchy textured tape (REACH/Listerine Ultraclean) first, and Glide as the fallback for contacts nothing else will pass. Expanding flosses like Dr. Tung’s and Cocofloss are the ones they steer tight-teeth patients away from. If floss snags in the same spot every time, have your dentist check for a rough filling edge or tartar before blaming the floss.
Q: Are floss picks as effective as regular floss? A: Floss picks can be effective for basic interdental cleaning, though they have limitations. Because the floss is held taut in a straight line, it’s harder to curve it into a C-shape around each tooth the way you can with finger-wound floss. That said, using a floss pick is significantly better than not flossing at all. If dexterity or convenience is an issue, floss picks are a perfectly reasonable choice. See our best floss picks roundup for top recommendations.
How We Chose These Picks
We selected these six flosses to cover the main approaches (smooth PTFE, textured microfilament, expanding, gentle, natural, and tape), so you can choose the type that fits your teeth and preferences. We cross-referenced dental professional recommendations on Reddit (r/DentalHygiene, r/askdentists, r/Dentistry, r/nontoxic), community discussion patterns, ADA guidance, and manufacturer specifications; the August 2026 update added 53 hydrated threads (1,395 comments) covering dental work, tight contacts, and the two brands the original research missed. We do not accept payment for product placement or rankings. For the full picture on how our dental research works, see our community consensus methodology.
