Humble Brush · Dental Floss
The Humble Co. Dental Floss Fresh Mint 50m
Lower concern; dental floss is not a typical PFAS application, but brand transparency is absent.
Humble Co.'s mint dental floss is made from nylon, a synthetic polymer not inherently associated with PFAS contamination. The brand provides no public PFAS statement or third-party verification.
Shop Humble Brush on Amazon →Material
Nylon floss (primary); mint flavoring/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
This product is nylon monofilament floss, a thermoplastic polymer that does not leach significantly during oral use because floss contact with saliva is brief and the mouth environment is not a solvent. The mint flavoring and coating (typically wax, cellulose, or gum arabic) are food-contact approved additives in cosmetic-grade concentrations. Nylon itself is chemically stable and does not off-gas or break down under normal flossing conditions. The 50-meter spool format eliminates single-use plastic waste, which is a genuine material advantage.
The brand's record and disclosure
Humble Brush positions itself as a sustainability-focused brand and publishes material safety data for toothbrushes and other oral care products. However, publicly available information does not confirm third-party certification (ISO, FSC, or EU Ecolabel) specifically for this floss product, nor does the brand publicly address PFAS presence or absence in the coating. The parent company's silence on PFAS testing in dental floss is not unusual in the category but represents a missed transparency opportunity. No safety recalls or complaints are on record for this product.
How it compares in its category
Nylon floss is the standard material across the category and poses no greater hazard than competitors from major brands. Alternatives include silk floss (biodegradable but higher cost), polyethylene (similar risk profile to nylon), and Teflon-type coating floss (occasionally associated with PFAS concern, though evidence is limited). Humble Co.'s emphasis on spool packaging over individual sachets reduces plastic waste versus many mass-market options. Mint flavoring is universal in the category and carries no documented oral toxicity at these concentrations.
If you buy it
Use the product as directed, storing the spool in a cool, dry place to prevent moisture from degrading the nylon and coating. Replace the spool when the floss becomes frayed, worn, or difficult to dispense, typically after 2-4 months of daily use for one person. The mint coating is safe to ingest in the small amounts that naturally occur during flossing and requires no special precaution. Discard floss in household waste; nylon does not biodegrade and is not currently recyclable in most programs, but the volume per person is negligible.
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.”
Mint flavoring allergenicity
Mint compounds (menthol, spearmint oil) are safe for most users but may trigger contact sensitivity in individuals with fragrance allergies or oral lichen planus; this is a category-wide issue, not brand-specific.
Wax or cellulose coating residue ingestion
Floss coatings are food-approved additives in minimal quantities and pose no documented harm from incidental oral ingestion; no recalls or adverse reports exist for this product.
Nylon microfiber shedding
Intact nylon floss does not shed microfibers during normal use; shedding only occurs if the floss is visibly degraded or damaged, in which case it should be replaced.
Coating degradation and taste change
Mint coating and wax may wear off after extended storage or exposure to humidity, reducing flavor and glide; this is a performance issue, not a safety hazard, but signals the product should be replaced.
Undisclosed additives in mint flavoring
The brand does not publicly list the specific flavoring compounds or proprietary coating additives; while regulatory compliance is assumed, lack of transparency prevents verification that no restricted substances are used.
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.