Nylon Floss by Butler · Dental Floss
Sunstar Butler Gum EasyThread Floss, Dispensers, 25 yd, 6/Pk, 3210PQ | Frontier Dental
Lower concern; standard nylon floss has no known PFAS triggers, but Butler makes no disclosure.
Sunstar Butler's standard nylon floss is a basic polymer without typical PFAS-risk features like water repellency, non-stick coatings, or grease resistance. No public PFAS claims or third-party testing are available.
Shop Nylon Floss by Butler on Amazon →Material
Nylon filament, unfilled or minimal coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
cosmetics is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
Butler EasyThread is a nylon monofilament floss, typically uncoated or with minimal wax/coating for ease of use. Nylon is a thermoplastic polymer that does not leach monomers or BPA under normal oral conditions because it is not in contact with heat, solvents, or aggressive pH environments that would degrade the polymer backbone. The filament is mechanically abraded against tooth surfaces and is not ingested in meaningful quantity, making oral exposure extremely low-risk compared to food-contact plastics or cookware.
The brand's record and disclosure
Butler (now part of Sunstar, a Japanese oral-care conglomerate) maintains a largely silent stance on material composition and chemical safety disclosures beyond basic product claims. No major recalls, PFAS-related warnings, or regulatory actions specific to Butler floss products are on record. The brand does not publish material safety data sheets or third-party certifications for dental floss, which is standard industry practice but limits independent verification of chemical inputs during manufacturing.
How it compares in its category
Nylon floss is the market standard and carries the same fundamental safety profile as competitors (Oral-B, Reach, Crest, Glide). Waxed variants may contain food-grade waxes or synthetic wax coatings; EasyThread does not appear to use Teflon-type coating-based or heavily fluorinated coatings based on available labeling. Silk or charcoal floss alternatives are marketed as 'natural' but offer no documented safety advantage and may degrade faster or harbor bacterial growth if not stored dry.
If you buy it
Use as directed: unwind, thread, and discard after single use. Do not reuse floss; nylon filaments can harbor oral bacteria and become compromised. Store the dispenser in a dry location away from heat or direct sunlight to prevent wax or coating degradation. If you experience gum irritation or allergic reaction (extremely rare), discontinue use and consult a dentist, but this is not a known issue with this brand. Replace the dispenser once the 25-yard spool is depleted; do not attempt to refill.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Nylon microfiber shedding
Nylon floss does not shed microplastics under normal oral use because the filament is mechanically designed to resist fraying and is completely removed from the mouth after use, not ingested in particle form.
Wax or coating ingestion
If EasyThread includes a wax or synthetic coating to aid gliding, small amounts may be swallowed during flossing. Food-grade and pharmaceutical-grade waxes are generally recognized as safe (GRAS) and approved for oral use, but Butler does not disclose the specific composition, so independent verification is not available.
Dye or colorant toxicity
Nylon floss is typically undyed or uses trace FDA-approved colorants for visibility; no azo dyes, heavy metal pigments, or reactive dyes are expected in dental floss, and no incidents are documented for this product or category.
Residual monomers or leachates from nylon synthesis
Commercial nylon filament is polymerized and stabilized to remove free monomers before use; residual caprolactam (the monomer for nylon 6) is tightly bound in the polymer chain and does not leach into the oral cavity under normal conditions, though Butler provides no test data.
Allergic contact dermatitis to floss material
Nylon allergy is rare but documented in sensitive individuals; it presents as gum irritation or localized mouth sores rather than systemic toxicity. If symptoms occur, switching to silk floss or using a different brand may resolve the issue, but this is not a known issue specific to Butler EasyThread.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Dental Floss
Cocofloss
Refill Trio
Coconut fiber, based floss with plant-based coating
Lower-concern dental product; natural materials and transparent PFAS stance, but no independent verification.
⚠Risky category by default
Dental Lace
Refillable Silk Dental Floss
Silk floss with compostable refillable packaging
Lower concern; silk floss with credible PFAS-free positioning and third-party certification.
✓Verified PFAS-free by a third party
Dental Lace
Plant Based/Vegan Floss Refillable Glass Container PFAS-Free (2 Spools/4-
Plant-based vegan floss (likely plant cellulose or silk fibers)
Lower-concern product with explicit PFAS-free claim; no third-party verification limits certainty.
⚠Risky category by default
More dental floss grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.