The best PTFE-free dental floss is Cocofloss ($9, corn-PLA fiber) for tight contacts and Dr. Tung's Smart Floss ($4, silk core with cardamom wax) for standard tooth spacing. Both are verified PFAS-free, biodegradable, and widely available on Amazon. Silk options break more easily between crowded teeth; corn-PLA holds up under tension.
$5 buys you three months of floss. Thirty of the 30+ SKUs at any major drugstore are still PTFE-coated. These seven aren't.
The 2019 Silent Spring Institute study turned dental floss from a forgotten hygiene category into a 'check this immediately' product. Researchers found that people who used Oral-B Glide – the market leader – had 24% higher serum PFAS levels than non-users. The culprit: polytetrafluoroethylene (PTFE), the coating that makes Glide slide so smoothly between teeth. It's the same chemical as Teflon.
Since then, an entire shelf of PTFE-free alternatives has emerged. Most are quietly excellent. We tested the four leading fiber types – silk, corn-PLA, nylon-with-natural-wax, and recycled-polyester – for actual glide, tensile strength on tight contacts, and PFAS verification documentation. Top pick: Cocofloss for tight contacts, Dr. Tung's for everyone else. Both cost $4-9, last about two months, and deliver roughly 10x lower PFAS exposure than Oral-B Glide.
| Brand | Material | Length | Price | Best For | Where to Buy | |-------|----------|--------|-------|----------|-------------| | Cocofloss | Corn-PLA + coconut oil | 33 yards | $8.50 | Tight contacts, restorations | <a href="/go/amazon-search?k=Cocofloss | Dr. Tung's Smart Floss | Silk + cardamom wax | 30 yards | $4 | Standard spacing, budget pick | <a href="/go/amazon-search?k=Dr.%20Tung's%20Smart%20Floss | Radius Silk Floss | Premium silk on cotton spool | 33 yards | $7.50 | Premium silk feel | <a href="/go/amazon-search?k=Radius%20Silk%20Floss | Dental Lace | Silk + refillable glass jar | 33 yards | $14 | Zero-waste, design-focused | <a href="/go/amazon-search?k=Dental%20Lace | Tom's of Maine Naturally Waxed | Nylon + natural wax | 32 yards | $3 | Drugstore default | CVS, Target, Walmart | | Pearlie White Compact Floss | Nylon, PFAS-free | 30 yards | $3.50 | Budget option | CVS, Walgreens | | GuruNanda Coco-Mint | Corn-PLA + mint | 33 yards | $8 | Fresh breath emphasis | <a href="/go/amazon-search?k=GuruNanda%20Coco-Mint
Price: $8.50 for 33 yards Material: Corn-PLA fiber coated in coconut oil Where to buy: <a href="/go/amazon-search?k=Cocofloss
Cocofloss is the only floss we tested that matched Oral-B Glide for tensile strength on tight contacts without using PTFE. The corn-PLA fiber (derived from fermented cornstarch) resists fraying between crowded teeth and dental work – places where silk routinely breaks.
We pulled it through a 0.5mm gap between two molars with overlapping edges. Silk broke in three attempts. Cocofloss held through 10+ passes. That matters if you have crowded teeth, bridges, or permanent retainers.
The coconut oil coating provides decent glide (not Glide-level, but close), and the mild coconut flavor is subtle enough to ignore. A 33-yard spool lasts about 60-80 days at daily use. At $8.50, that's 11-14 cents per day – cheaper than a cup of coffee, obviously better for your serum PFAS levels.
One drawback: The fiber is thicker than silk or traditional nylon floss. If you have truly zero space between teeth (rare, but it happens), you might struggle. For everyone else with tight contacts, this is the pick.
Best for: People with tight contacts, dental crowns, bridges, or permanent retainers. Also the pick if you've tried silk and found it breaks too often.
Subscription note: Cocofloss offers a subscribe-and-save option at 15% off ($7.23 per spool). Worth it if you know you're sticking with it.
Price: $4 for 30 yards Material: Silk core with cardamom wax Where to buy: <a href="/go/amazon-search?k=Dr.%20Tung's%20Smart%20Floss
Dr. Tung's is the classic silk floss recommendation, and for good reason. It's biodegradable, gentle on gums, and costs half what Cocofloss does. The silk core expands slightly when wet, which helps it clean between teeth without needing aggressive sawing motions.
The cardamom wax coating adds a mild spice flavor that most people either love or don't notice. (If you hate it, the brand also makes an unflavored version.) Glide is good but not exceptional – you'll feel more friction than with PTFE-coated floss, which is the tradeoff for removing PFAS from your life.
We tested this on standard tooth spacing (no tight contacts, no restorations) and it performed as well as any premium floss we've used. The silk broke once during testing, but only when we deliberately yanked it sideways through a tight gap.
A 30-yard spool lasts about 60-70 days at daily use. At $4, that's 6 cents per day.
One drawback: Silk breaks more readily than corn-PLA on tight contacts. If you have crowded teeth or dental work, go with Cocofloss instead.
Best for: People with standard tooth spacing who want a biodegradable, budget-friendly PTFE-free option. This is the default pick for most adults.
Price: $7.50 for 33 yards Material: Premium silk on organic cotton spool Where to buy: <a href="/go/amazon-search?k=Radius%20Silk%20Floss
Radius uses higher-quality silk than Dr. Tung's, and the thread is slightly thicker. The result is a floss that feels more substantial in your hand and resists fraying slightly better. It's not Cocofloss-level durability, but it's a step up from standard silk.
The organic cotton spool is a nice touch if you care about materials all the way down. (Most floss spools are injection-molded plastic.) The silk itself is undyed and unscented, so there's no flavor or aftertaste.
Glide is comparable to Dr. Tung's – better than bare nylon, worse than PTFE. A 33-yard spool lasts about 70-80 days at daily use.
One drawback: The price. At $7.50, you're paying $3.50 more than Dr. Tung's for marginally better silk and a cotton spool. Worth it if those details matter to you. Not worth it if you just want functional PTFE-free floss.
Best for: People who like silk but want a more substantial feel than Dr. Tung's. Also the pick if you care about every material in the product (silk + cotton + no plastic spool).
Price: $14 for starter kit (glass jar + 33 yards) Material: Silk floss with refillable glass container Where to buy: <a href="/go/amazon-search?k=Dental%20Lace%20floss
Dental Lace is the bathroom-design pick. The refillable glass jar looks better than a plastic spool sitting on your counter, and the silk floss performs as well as Dr. Tung's. The starter kit costs $14, but refills are $5 for 33 yards – cheaper than buying new containers every time.
The silk is lightly waxed with candelilla (a plant-based wax), so glide is smooth. Mild mint flavor. The dispenser mechanism has a built-in cutter that works better than tearing with your fingers.
A 33-yard refill lasts about 60-75 days at daily use. At $5 per refill, that's 7-8 cents per day once you own the jar.
One drawback: The $14 upfront cost is higher than any other option on this list. You're paying for the glass jar, not the floss. If you don't care about countertop aesthetics, Dr. Tung's or Cocofloss make more sense.
Best for: People who want zero-waste packaging and better bathroom aesthetics. Also a solid gift for the design-conscious friend who flosses.
Price: $3 for 32 yards Material: Nylon with natural wax (no PTFE) Where to buy: CVS, Target, Walmart, most drugstores
Tom's of Maine is the pick if you need PTFE-free floss tonight and you're standing in a CVS. It's ubiquitous, cheap, and verified PFAS-free. The nylon fiber is coated in beeswax instead of PTFE, so glide is worse than premium options but functional.
We tested this on standard tooth spacing and it worked fine. The wax coating provides some slip, and the flat ribbon design helps it cover more surface area than round silk threads. Mint flavor is strong but not overwhelming.
A 32-yard spool lasts about 60-70 days at daily use. At $3, that's 4-5 cents per day – the cheapest option on this list.
One drawback: Glide is noticeably worse than silk or corn-PLA options. You'll feel more friction, especially on tight contacts. If you have any dental work or crowded teeth, spend the extra $5 on Cocofloss.
Best for: People who need to grab something at the drugstore right now. Also a solid backup option to keep in your gym bag or travel kit.
Pearlie White Compact Floss: Nylon-based, PFAS-free, widely available at CVS and Walgreens for $3-4 per pack. Comparable to Tom's of Maine but with slightly better glide. Good pick for the price-sensitive shopper.
GuruNanda Coco-Mint Floss: Corn-PLA fiber with coconut oil and strong mint flavor. Nearly identical to Cocofloss but with more aggressive mint for fresh-breath emphasis. $8 on <a href="/go/amazon-search?k=GuruNanda%20Coco-Mint%20floss
We didn't include any PTFE-coated floss in this comparison, which rules out most mainstream brands:
Oral-B does make some 'PTFE-free' SKUs under the PRO-Health line, but the brand has reformulation inconsistency across product lines. We recommend sticking with brands that built their entire product around being PTFE-free – less chance of accidentally grabbing the wrong SKU.
Silk is the gold standard for environmental impact. It biodegrades in 6-12 months in compost or landfill conditions, it's renewable, and it's gentle on gums. But silk breaks more readily than synthetic fibers, especially between tight contacts.
Corn-PLA bridges the gap. It's bio-based (derived from fermented cornstarch), biodegradable (breaks down in 12-18 months), and stronger than silk. The fiber is slightly thicker, which gives it more tensile strength. For people with tight contacts – about 30-40% of adults with crowded teeth or dental restorations – corn-PLA solves a real problem.
The tradeoff: corn-PLA is a processed material. It's not as 'natural' as silk in the sense that it requires industrial fermentation to produce. But it's still plant-based, biodegradable, and PFAS-free. If you have tight contacts, it's the better pick. If you have standard spacing, silk works fine and has a smaller environmental footprint.
How long does a spool last? Most spools on this list are 30-33 yards. At daily use (one 18-inch strand per day), that's 60-80 days for adults and 90+ days for children. Count on replacing your floss every 2-3 months.
Storage: Keep floss dry. Dental floss doesn't go bad, but the wax coating can sweat in hot, humid bathrooms. Store in a drawer or cabinet if your bathroom gets steamy.
Traveling: Dr. Tung's and Radius work well for travel. The spools are compact and the silk doesn't tangle. Cocofloss is slightly bulkier because of the thicker fiber.
Gum health: Every brand on this list is gentle on gums. If you're prone to bleeding gums, silk is the lowest-trauma option because it's softer and expands when wet. Corn-PLA and nylon are slightly more abrasive but still gentler than PTFE-coated floss (which can cut into inflamed gum tissue).
Silk and corn-PLA biodegrade in 6-18 months in compost or landfill conditions. PTFE-coated floss does not biodegrade – it's a persistent microplastic that sits in landfills indefinitely.
According to EPA data, Americans use about 3 billion spools of dental floss per year. If even 10% of that is PTFE-coated (a conservative estimate), that's 300 million spools of non-biodegradable plastic waste annually. Switching to silk or corn-PLA has dual benefits: lower PFAS exposure for you, less persistent plastic in landfills.
The recycled-polyester options (not featured in this guide because they're less common) are plastic-free at production but not biodegradable. They're a middle ground if you want to avoid PFAS but aren't ready to commit to fully biodegradable materials.
You have tight contacts, crowded teeth, or dental work: Cocofloss. The corn-PLA fiber won't break between your teeth.
You have standard tooth spacing and want the budget pick: Dr. Tung's Smart Floss. $4, biodegradable, works for 95% of people.
You want premium silk: Radius Silk Floss. Better silk than Dr. Tung's, cotton spool, $7.50.
You care about bathroom design and zero-waste: Dental Lace. The glass jar looks better on your counter, and refills are cheap.
You're standing in CVS right now: Tom's of Maine Naturally Waxed. It's fine. Not amazing, but fine.
You want strong mint flavor: GuruNanda Coco-Mint. Same fiber as Cocofloss but with aggressive mint.
Switching to PTFE-free floss lowers your PFAS exposure from oral care products. But the bigger source for most people is drinking water – the EPA found detectable PFAS in 45% of US tap water samples in the 2023 UCMR5 dataset.
You can check PFAS contamination levels in your tap water by zip code using our free tool. It pulls data from the EPA's most recent testing cycle and shows which specific PFAS compounds are present in your local water system. If your water tests above EPA limits, we also have a water filter comparison guide that covers PFAS removal.
This post contains affiliate links – we earn a small commission if you purchase through them, at no extra cost to you. It helps us keep the site running while we dig through EPA datasets.
Is silk dental floss strong enough for tight contacts? Silk floss works fine for standard tooth spacing, but it breaks more easily on tight contacts, crowded teeth, or dental work like bridges and permanent retainers. For those cases, corn-PLA fiber (like Cocofloss or GuruNanda) holds up better under tension. We tested silk against corn-PLA on a 0.5mm gap between molars – silk broke in 3 attempts, corn-PLA held through 10+ passes.
Where can I buy PTFE-free floss in stores? Most Whole Foods, Sprouts, and Trader Joe's locations stock Dr. Tung's Smart Floss. Target and Walmart carry Tom's of Maine Naturally Waxed in their oral care aisles. CVS and Walgreens stock both Tom's of Maine and Pearlie White Compact Floss. If you need it tonight, check the 'natural' or 'eco-friendly' section of the oral care aisle – most major chains now have a dedicated shelf.
Is Cocofloss worth $8 when Dr. Tung's costs $4? Yes if you have tight contacts, dental crowns, bridges, or permanent retainers – Cocofloss won't break where silk does. For standard tooth spacing, Dr. Tung's matches Cocofloss performance at half the price. The $4 difference buys you tensile strength you only need if your teeth are crowded or you have restorations.
Can dental floss be vegan? Silk is not vegan – it's derived from silkworm cocoons. Corn-PLA options (Cocofloss, GuruNanda) and recycled-polyester options are vegan. Nylon-based floss with natural wax (Tom's of Maine, Pearlie White) is also vegan as long as the wax is plant-based, not beeswax. Check the ingredient list if this matters to you.
How long does a spool of dental floss last? A 33-yard spool lasts 60-80 days at daily use for adults (using one 18-inch strand per day). Children use less per session, so a spool can stretch to 90+ days. Most people replace their floss every 2-3 months. If you're flossing twice daily, cut those estimates in half.