Sunstar GUM · Dental Floss
Sunstar Butler Gum EasyThread Floss, Sample Pack, 100/Pk, 3200PQ | Frontier Dental
Lower concern; standard dental floss with no documented PFAS risk, but no brand transparency.
Sunstar GUM EasyThread is a basic nylon/polyester dental floss with no known PFAS-containing coatings or treatments. The brand makes no PFAS claims and provides no third-party verification. Dental floss is not a high-risk product category for PFAS contamination, unlike nonstick cookware or water-resistant apparel.
Shop Sunstar GUM on Amazon →Material
Nylon/polyester dental floss
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
Sunstar GUM EasyThread is nylon or polyester dental floss, the most common floss material globally. Nylon and polyester are inert thermoplastics that do not leach monomers or plasticizers into saliva during normal use because they are not heated and contact is brief. The "EasyThread" designation refers to a threader tip for easier insertion into tight contacts, not a chemical additive of concern. No wax, flavoring, or coating on this product type poses established toxicity risk at typical use levels.
The brand's record and disclosure
Sunstar GUM (owned by Sunstar Inc., Japan) is a major oral-care manufacturer with long market history and no documented safety recalls or regulatory action against this floss product line. The brand does not publish detailed material safety or manufacturing transparency statements on PFAS, allergens, or heavy metals for dental floss. This silence is typical of the category; dental floss is a low-volume, low-cost consumable not subject to cosmetic or drug premarket review in most jurisdictions, so disclosure pressure is minimal.
How it compares in its category
Dental floss is one of the lowest-risk consumer oral-care products because the contact surface is tiny, duration is seconds to minutes, and saliva pH is neutral. Nylon floss (GUM's material) is chemically identical to that sold under private labels and premium brands; material hazard tier does not vary meaningfully by brand. The sample pack format (100 individual threads) is typical and poses no additional risk versus bulk dispensers.
If you buy it
Use once daily or as recommended by your dentist; no special precautions apply. Do not swallow floss or use if gums are severely inflamed without consulting a dentist first. Store in a cool, dry place to prevent moisture absorption that can cause mold growth on unused threads. Replace the pack if any threads show discoloration, odor, or visible damage before use.
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
Dental floss is designed to be non-shedding under normal use. No public reports link GUM or standard nylon floss to microplastic ingestion or gut accumulation. Swallowed floss is generally excreted intact.
Dyes and colorants (if present)
GUM EasyThread is typically white or pale, minimizing need for synthetic azo dyes. If colored variants exist, heavy-metal contamination in pigments is not documented for any major dental floss brand and would be highly unusual given regulatory oversight of oral-contact materials.
Flavor and additive residues
This product sample pack does not list flavoring. Even flavored dental floss (mint, cinnamon) uses food-grade additives at trace levels; no toxicity cases are documented in medical literature for flavored floss at normal use.
Talc or mineral contamination
Dental floss is not dusted or coated with talc or other mineral fillers. Sunstar GUM's product line has not been implicated in talc contamination incidents.
Formaldehyde-releasing resins or binders
Nylon floss does not require formaldehyde-based bonding or finishing agents. No residual formaldehyde is expected in the final product or its saliva-contact surfaces.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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.