Is There PFAS in Floss?

The Short Answer

Whether your oral care routine is exposing you to forever chemicals depends heavily on the brand you buy.

Recent independent lab testing revealed that 33% of popular dental floss products contain indications of PFAS. The worst offender, Oral-B Glide, contained an astonishing 248,900 parts per million (ppm) of organic fluorine—meaning the product was nearly 25% coated in forever chemical indicators. Which Floss Has Pfas

Why This Matters

It's not just an environmental issue—the PFAS in your floss actually makes it into your bloodstream. A landmark 2019 study from the Silent Spring Institute found that women who flossed with Oral-B Glide had significantly higher blood levels of PFHxS (a specific forever chemical) than those who didn't. Is Glide Floss Safe

Your gums are highly vascular and prone to bleeding. Micro-tears during flossing provide a direct pathway for chemicals to enter your body. When you use a floss coated in forever chemicals, you are repeatedly exposing a sensitive, absorptive area to known endocrine disruptors. Is Dental Floss Safe

But there is good news for parents. Every single children's floss tested by Mamavation was free of organic fluorine. While adult formulas are often loaded with synthetic lubricants, the kids' versions overwhelmingly use safer alternatives. Is Kids Toothpaste Safe

What's Actually In Dental Floss

• PTFE (Polytetrafluoroethylene) — This is the exact same chemical used to make Teflon non-stick pans. It is intentionally added to "glide" style flosses to make them slip effortlessly between tight teeth. What Toothpaste Ingredients Are Harmful
• Organic Fluorine — This is the chemical marker laboratories look for when testing for forever chemicals. It indicates the presence of a fluorinated compound, which makes up the backbone of PFAS.
• Petroleum-based Waxes — Many conventional flosses use microcrystalline wax derived from petroleum to coat their strings instead of using natural beeswax or plant alternatives. Waxed Vs Unwaxed Floss

What to Look For

Green Flags:

• Unwaxed or naturally waxed — Look for pure beeswax, candelilla wax, or carnauba wax on the ingredient list.
• Silk or bamboo fibers — Natural materials don't require heavy synthetic chemical treatments to function properly. Are Bamboo Toothbrushes Better
• Transparent testing — Brands that explicitly state "PFAS-free" and back it up with third-party organic fluorine testing. What Floss Is Pfas Free

Red Flags:

• "Glide" or "Smooth" marketing — If a mainstream brand brags about how slippery it is, it's highly likely using PTFE to achieve that texture.
• Generic store brands — Target's Up & Up and Amazon's Solimo "smooth slide" varieties both tested over 70,000 ppm for organic fluorine in recent labs.
• Vague "flavorings" — Synthetic flavors often come with undisclosed chemical carriers that aren't ideal for mucosal absorption.

The Best Options

Switching to a clean floss is one of the easiest, cheapest non-toxic swaps you can make in your bathroom. Safest Dental Floss

The Bottom Line

1. Ditch the "glide." If your floss feels like a flat, slippery ribbon, it's probably made with PTFE. Switch to a traditional woven or natural string.

2. Don't stop flossing. The risks of periodontal disease and oral inflammation far outweigh the risks of floss, especially since clean alternatives are readily available.

3. Upgrade your wax. Look for products explicitly using candelilla, carnauba, or pure beeswax to coat their strings.

FAQ

Did Oral-B fix their Glide floss?

Procter & Gamble claims they removed PTFE from Oral-B Glide formulations as of 2025, but independent labs haven't verified the new formula yet. Until third-party organic fluorine testing proves the product is clean, it's safer to rely on brands that have never used forever chemicals.

Are water flossers a safer alternative?

Yes, water flossers use zero chemicals and are incredibly effective for gum health. If you have tight teeth and hate the friction of natural string floss, a Waterpik is a fantastic, non-toxic investment. Is Waterpik Better Than Flossing

Does string material matter?

Textured strings actually remove more plaque than smooth PTFE ribbons. While "gliding" flosses feel easier to use, woven materials like silk, polyester, or bamboo physically grab and scrub away bacteria much better. Cocofloss Vs Regular Floss

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7. 7. pfasproject.com
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12. 12. lindsaydahl.com