Humble Brush · Dental Floss
The Humble Co Dental Floss
Lower PFAS concern; standard plant-fibre floss with no known treatments requiring forever chemicals.
Humble Co's dental floss is made from plant-derived fibres (typically bamboo cellulose), which are inherently unlikely to contain PFAS since they don't require water-repellent or non-stick coatings.
Shop Humble Brush on Amazon →Material
Plant-based fibre (derived from bamboo/plant cellulose)
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
Humble Co Dental Floss is constructed from plant-based cellulose fibers (bamboo or similar renewable sources) rather than nylon or synthetic polymers. Plant cellulose fibers are biodegradable and do not off-gas volatile organic compounds or break down into microplastics during normal use. The fiber itself is mechanically processed rather than chemically synthesized, which eliminates exposure to common synthetic coating hazards found in conventional floss such as teflon (Teflon-type coating) or petroleum-derived waxes.
The brand's record and disclosure
Humble Brush positions itself as a sustainability-focused oral care brand with emphasis on plant-based and compostable products. The brand does not appear to have published detailed third-party safety certifications (e.g., NSF, ISO) for this specific floss product, nor has it issued comprehensive material safety documentation. No significant recalls or safety controversies have been publicly reported for Humble Co Dental Floss. The brand's silence on PFAS is typical for plant-fiber floss manufacturers, as conventional plant cellulose formulations do not require fluorochemical treatments.
How it compares in its category
Plant-based floss sits at the lower end of chemical hazard risk compared to conventional nylon floss coated with Teflon-type coating, silicone, or wax blends. Unlike some eco-floss brands, Humble Co does not appear to use wax coatings derived from paraffin or synthetic oils, which can leave residue or degrade over time. Most major alternatives (Oral-B, Colgate, Listerine) use nylon with synthetic coatings; plant-based options are less common and generally have simpler material profiles.
If you buy it
Use as directed for routine interdental cleaning; no special storage or heat precautions are necessary for cellulose floss. Plant-based fibers may shred or fray more easily than nylon if pulled aggressively, so gentle technique is recommended. Replace the spool when fibers become visibly worn or frayed. Store in a cool, dry location to prevent mold growth on the cellulose fibers, though this is a cosmetic rather than health risk.
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.”
Bacterial or mold growth on organic fiber
Plant cellulose is susceptible to microbial colonization if stored in high humidity; risk is low with routine household storage but increases if floss container remains damp or sealed after use.
Coating contaminants (wax, oils)
No evidence of synthetic wax or oil coatings in Humble Co formulation; product appears to rely on the fiber structure itself for glide without additional chemical treatments.
Microplastic shedding during use
Plant cellulose degrades to cellulose fragments, not microplastics; minimal environmental or ingestion concern compared to nylon floss products.
Formaldehyde or dye residues
Plant-based cellulose floss does not require formaldehyde-releasing resins or synthetic azo dyes for function; no public reports of such additives in this product line.
Choking or ingestion hazard
Standard for all dental floss; no product-specific risk. Fibers are thin and intended for oral use; standard adult usage precautions apply.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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
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Refill Trio
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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-
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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.