PFAS-Free Dental Floss: The Best Non-Toxic Brands for 2026 (and the Ones to Avoid)

The Science of Dental Floss Toxicity: Why It Matters

PFAS (per- and polyfluoroalkyl substances) are a class of thousands of synthetic fluorinated chemicals that resist heat, water, and oil — properties that make them useful as "glide" coatings on dental floss. The concern is that PFAS can leach into oral tissues and the bloodstream during normal flossing.

The most significant peer-reviewed study to date on this topic was published in January 2019 in the Journal of Exposure Science & Environmental Epidemiology, led by researchers at the Silent Spring Institute in collaboration with the Public Health Institute. The researchers measured PFAS serum levels in a group of adult women and cross-referenced them with self-reported flossing habits. Women who reported using Oral-B Glide — a PTFE-coated product — tended to have higher blood levels of PFHxS (perfluorohexanesulfonic acid) than women who did not use that product. Product testing via particle-induced gamma-ray emission (PIGE) spectroscopy confirmed that all three Oral-B Glide products tested positive for fluorine, consistent with PTFE content.

Important caveats: This was an observational, cross-sectional study — it identifies an association, not a proven causal mechanism. The study group was relatively small and specific (middle-aged women), and the researchers acknowledged that dental floss is just one of many possible PFAS exposure pathways. More research is needed before firm conclusions can be drawn about the magnitude of risk from floss alone. A 2025 follow-up study in the Journal of Clinical Periodontology described floss use as a potential "double-edged sword," noting that flossing provides genuine gum-health benefits even as PFAS exposure remains a concern to be studied further.

PFAS are sometimes called "forever chemicals" because most do not break down readily in the environment or in the body, and some have been associated in epidemiological research with various health concerns. However, the specific risks from the comparatively low-dose oral exposure from flossing are not yet well-characterised. What is clear is that if a PFAS-free alternative flosses just as effectively, the precautionary case for switching is straightforward.

Beyond PFAS, some conventional flosses may also contain synthetic flavouring agents or artificial sweeteners. Checking the full ingredient list — or using the Low Tox Gear free ingredient scanner — is the easiest way to know what you're working with.

Regulations & Standards to Know in 2026

The regulatory picture for PFAS in dental products has shifted meaningfully in recent years. Here is what is real and currently in force:

• FDA classification (USA) — 21 CFR § 872.6390: Dental floss is classified as a Class I medical device under the US Food & Drug Administration's dental-device regulations. This means it is subject to "general controls" — basic safety and labelling requirements — but is generally exempt from premarket notification requirements, provided it contains no chemicals intended to provide a therapeutic benefit. Critically, floss manufacturers are not required by the FDA to disclose every coating or chemical used, which is one reason the ingredient transparency gap exists.
• California Proposition 65: PFOA (perfluorooctanoic acid) is listed under Prop 65 as a substance known to cause cancer. Any product sold in California that exposes consumers to Prop 65-listed chemicals above safe-harbour thresholds requires a warning. Several PFAS compounds are on the Prop 65 list; PTFE itself is not currently listed, but associated breakdown products may be.
• Minnesota (USA) — Amara's Law, effective 1 January 2025: Minnesota became one of the first US states to ban intentionally added PFAS in dental floss. Products with intentionally added PFAS (as defined by state statute) cannot be sold in Minnesota as of this date.
• Maine (USA) — effective 1 January 2026: Maine extended its phased PFAS-in-products programme to include dental floss and other personal-care categories. All products with intentionally added PFAS sold in Maine are targeted for an eventual phase-out, with 2032 set as the backstop deadline unless PFAS use is deemed "currently unavoidable."
• EU REACH / ECHA: The European Chemicals Agency has been advancing a broad universal PFAS restriction proposal. As of 2026, ECHA continues to develop the universal restriction framework, with numerous targeted derogations under consideration. Additionally, France enacted its own national law from 1 January 2026 banning PFAS in a range of consumer products. A broader EU-level restriction is expected to be formally adopted in the coming years; specific timelines remain subject to legislative process.
• Australia: Australia's industrial chemicals regulator (AICIS) and the ACCC monitor PFAS in consumer products. There is currently no specific product-by-product ban on PFAS in dental floss at the federal level in Australia, though broader PFAS frameworks are under active policy review. Opting for internationally PFAS-free certified products remains the most reliable approach for Australian shoppers.

Top Non-Toxic Dental Floss Brands: 2026 Comparison

The brands below have been selected based on publicly verifiable ingredient disclosures, third-party testing where available, and consistent coverage in non-toxic product reviews. Qualitative claims are based on manufacturer statements and independent review sources; no lab numbers have been independently reproduced by Low Tox Gear. Always check the current product formulation before purchasing, as formulas can change.

For a curated selection of these and similar products, browse our PFAS-free collection at Low Tox Gear.

How to Shop for Non-Toxic Floss (2026)

• Avoid "glide", "smooth", "comfort" or "PTFE" in the product name or description — these descriptors frequently signal PTFE or fluoropolymer coatings. When in doubt, scan the product barcode before you buy.
• Look for fully disclosed ingredient lists. Responsible non-toxic brands publish every ingredient. If a brand won't share its ingredient list, treat that as a red flag.
• Prioritise third-party testing. Brands like Dental Lace and Cocofloss use ISO-accredited labs to verify their PFAS-free claims — look for explicit mention of third-party verification rather than self-declared claims alone.
• Choose natural wax over synthetic. Candelilla wax, carnauba wax, and beeswax are the most common natural glide agents. Microcrystalline wax (paraffin-derived) is not inherently harmful but is petroleum-based. PTFE is the coating to actively avoid.
• Opt for unflavoured or essential-oil flavoured. Synthetic flavouring agents and artificial sweeteners (such as sucralose or saccharin) in some flosses are separate from the PFAS issue. Essential oils or unflavoured products are the cleaner choice.
• Consider packaging. Refillable glass dispensers eliminate plastic waste from the floss category entirely — a meaningful improvement for households reducing single-use plastics.
• Check for regulatory coverage. Products that comply with Minnesota and Maine's intentionally-added-PFAS bans (both now in force) have already cleared a meaningful regulatory bar — some brands flag this compliance explicitly.

Key Terms to Look For

PFAS (Per- and Polyfluoroalkyl Substances)

A broad family of thousands of synthetic chemicals that share carbon-fluorine bonds — among the strongest in chemistry — making them resistant to degradation. Some PFAS have been associated in research with human health concerns. The "forever chemicals" label refers to their environmental persistence.

PTFE (Polytetrafluoroethylene)

The most common fluoropolymer used to coat "glide"-style dental floss. Marketed under the Teflon trade name. PTFE is technically classified as a fluoropolymer rather than a PFAS under some regulatory frameworks, but it is manufactured using PFAS chemicals and can contain PFAS impurities. Its presence in floss is identified by fluorine detection in product testing.

PFHxS (Perfluorohexanesulfonic Acid)

The specific PFAS compound found at elevated levels in blood serum of participants who used PTFE-coated floss in the 2019 Silent Spring Institute study. It is one of the longer-chain PFAS variants subject to increasing regulatory scrutiny globally.

Candelilla Wax

A plant-derived wax extracted from the candelilla shrub (Euphorbia antisyphilitica), native to northern Mexico. Vegan, non-toxic, and widely used in natural personal-care products as a binder and glide agent. The most common wax in premium PFAS-free flosses.

Intentionally Added PFAS

A regulatory definition used in several US state laws (Minnesota, Maine) and the EU framework: PFAS that a manufacturer deliberately incorporates into a product, as distinct from trace incidental contamination. Products meeting these legal definitions must be reformulated or removed from sale in regulated jurisdictions.

Third-Party Testing / ISO-Accredited Lab

Testing conducted by an independent laboratory operating to ISO 17025 standards — the international benchmark for testing laboratory competence. Third-party ISO testing of a product's PFAS-free status carries significantly more weight than a manufacturer's self-declaration.

Frequently Asked Questions

Is all dental floss coated in PFAS / Teflon?

No. Only floss marketed for its smooth "glide" — typically products with "Glide," "Smooth," or "Comfort" in the name — is likely to contain PTFE or other fluoropolymer coatings. Standard waxed cotton, silk, and many nylon flosses do not use fluoropolymer coatings. The safest approach is to choose a brand that explicitly discloses its full ingredient list and confirms PFAS-free status, or to scan the barcode at Low Tox Gear before purchasing.

How do I know if my current floss contains PFAS?

Check whether the product name or packaging references "glide," "Teflon," or PTFE. If the ingredient list is not disclosed, that alone warrants caution. The Silent Spring Institute's 2019 research used PIGE spectroscopy (fluorine detection) to identify coated products — a technique not available to consumers directly. Switching to a brand with verified third-party PFAS testing is the practical alternative to home testing.

Does PFAS-free floss clean as effectively as Glide-style floss?

For most people, yes. Silk floss and textured polyester flosses such as Cocofloss are routinely recommended by dentists in non-toxic oral-care contexts and perform well in independent consumer reviews. Some users find PTFE-coated floss easier to slide through very tight contacts; if this applies to you, a slightly thinner silk option or a water flosser may help with the transition. The consensus in the dental literature is that any flossing is substantially better than none, so maintaining the habit with any PFAS-free product is the priority.

Are these brands available in Australia?

Several of the brands listed — including Dental Lace, RADIUS, and Cocofloss — are available via Australian online retailers and health food stores, though availability varies by region. Checking the Low Tox Gear PFAS-free collection is the fastest way to find what's currently stocked and shippable to Australian addresses. If you're unsure about any product's ingredients, the free ingredient scanner at scan.lowtoxgear.com can help you check on the spot.

This page is general information only, not medical or dental advice. Always consult a qualified dental professional for personalised oral-health guidance. For broader research on heavy-metal and chemical contamination in everyday consumer products, see our 2026 guide to heavy metals in dark chocolate — the same evidence-led approach applied to another commonly overlooked daily exposure.

Want to check any oral-care product — or any household product — for concerning ingredients before you buy? Scan any product's ingredients free at scan.lowtoxgear.com.