Isodent · Dental Floss
Dental Floss Unwaxed, 100 yd
Lower concern; unwaxed nylon floss has no known PFAS markers, but brand transparency is absent.
Unwaxed dental floss typically contains nylon filament without added coatings or water-resistant treatments that would introduce PFAS. Isodent provides no public PFAS disclosure, and no independent lab testing for this product is publicly available.
Shop Isodent on Amazon →Material
Unwaxed nylon filament
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 unwaxed nylon filament, meaning it consists of polyamide fibers without a wax coating (which would typically be beeswax, carnauba, or synthetic wax). Nylon filament itself is chemically inert in the mouth at normal use temperatures and does not dissolve or degrade during brief daily flossing. The absence of wax reduces any potential for additive leaching, making unwaxed nylon one of the simpler dental floss formulations.
The brand's record and disclosure
Isodent is a smaller oral care brand with minimal public disclosure history regarding manufacturing practices, material sourcing, or safety testing protocols. No established controversies, recalls, or certifications (such as third-party testing or eco-labels) are on record for this brand. The brand's silence on PFAS and other chemical transparency is typical of budget-tier dental products but does not indicate a known safety failure.
How it compares in its category
Unwaxed nylon floss is a baseline category option and is generally considered safer than waxed variants because it eliminates wax additives and their potential contaminants. It is less popular than waxed floss (which feels smoother and slides more easily between teeth) and occupies the same safety tier as other unwaxed nylon products from mainstream brands. Silk floss and high-end alternatives may offer slightly better environmental profiles but carry no measurable safety advantage for oral use.
If you buy it
Use 12 to 18 inches per session, discard after one use, and store in a dry environment to prevent bacterial colonization of the spool. Nylon is durable and will not fray or shed microfibers under normal flossing pressure. Replace the spool once the remaining length becomes difficult to grip, typically every 2 to 4 weeks depending on flossing frequency. Do not swallow floss; any ingested fragments are inert and will pass harmlessly through the digestive tract.
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 degradation and microfiber shedding
Unwaxed nylon filament is stable in the mouth and does not fragment or shed microplastics under normal flossing force. No reports of fiber breakage or particle release specific to Isodent or similar unwaxed nylon floss exist in public records.
Bacterial growth on spool or residual fibers
Any floss spool stored in a humid bathroom can accumulate biofilm if not allowed to dry between uses. This is a hygiene concern rather than a chemical one and is mitigated by storage in a dry location and regular spool replacement.
Allergic reaction to nylon or spool material
Nylon is hypoallergenic and rarely triggers oral contact dermatitis. No sensitization events or recalls related to Isodent unwaxed floss are documented.
Dye or colorant contamination
Unwaxed nylon floss is typically undyed or colored with food-grade or cosmetic-grade colorants; Isodent product specifications do not disclose dye type, but the standard for dental floss is low-toxicity pigments. No adverse events are on record.
Ingestion of fibers (accidental swallowing)
Nylon is not digestible and does not absorb water or break down in the GI tract; swallowed floss passes through intact and poses no chemical or toxicological risk, though mechanical obstruction is a remote physical hazard in young children.
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.