Sunstar Gum Expanding Floss-30m
Low PFAS concern; standard nylon floss carries minimal risk.
Dental floss is a small-use cosmetic product with minimal surface area for PFAS coatings. Standard nylon floss carries lower concern than water-resistant or stain-treated products. Brand makes no PFAS claims.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Nylon dental floss
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Sunstar Gum Expanding Floss-30m is made of, ingredients and materials
Sunstar Gum Expanding Floss is nylon-based dental floss, a synthetic polymer chosen for its strength, flexibility, and ability to expand slightly when moistened to reach interproximal spaces. Nylon does not leach plasticizers like phthalates or BPA under normal oral-use conditions because it is a condensation polymer with minimal residual monomers and is not subject to heat stress in the mouth. The 'expanding' feature is a mechanical property of the nylon fiber structure, not a chemical additive, making the formulation straightforward.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Fragrance allergens and irritants
Some dental floss products include flavoring or fragrance (mint, cinnamon); Sunstar Gum Expanding Floss product details do not specify flavor ingredients. If present, fragrance can trigger contact sensitivity in sensitive oral tissues, though severity is typically mild and localized.
Nylon microparticle shedding or ingestion
Nylon fibers can fray and shed microscopic particles during use; involuntary ingestion is possible but not documented as a health concern because floss is used in small quantities and the particles are not bioaccumulative.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
Dental floss formulations do not typically include preservatives or formaldehyde-releasing agents; nylon is inherently stable and does not require antimicrobial coatings under oral-use conditions.
Source, ATSDR ↗Heavy metals
Nylon floss is either clear, white, or dyed with minimal colorant load. No documented cases of lead, cadmium, or other heavy-metal contamination in dental floss from established manufacturers.
Source, FDA ↗Talc contamination
Dental floss does not use talc as a release agent or filler; nylon is not dusted or coated with mineral powders in standard formulations.
The full breakdown
The brand's record and disclosure
Sunstar is a Japanese oral-care manufacturer with established safety practices and regulatory compliance in multiple markets, including the US FDA framework for oral-care devices. The brand does not publish detailed ingredient or PFAS stance documentation on this specific product, but Sunstar products are widely sold and no safety recalls or contamination incidents have been publicly documented for their floss lines. Absence of transparency is not unusual in the dental-floss category, where formulations are simple and regulatory oversight is minimal.
How it compares in its category
Dental floss is one of the lowest-risk consumer cosmetic products because oral exposure is brief and ingestion is minimal and involuntary. Nylon floss is the category standard alongside polytetrafluoroethylene (Teflon-type coating) alternatives; both carry no established hazards related to heavy metals, formaldehyde, or dyes in typical use. Expanding floss does not differ materially in safety profile from unwaxed or waxed variants; the expansion is mechanical, not chemical.
If you buy it
Store at room temperature and keep dry; nylon has no heat limits relevant to oral-care use. Replace the spool when fraying occurs or every 6-12 months, as nylon fibers can degrade with exposure to saliva and friction. Floss should not be swallowed; spit it out after use. No special maintenance is required.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Sunstar has made none
Formulations change between production runs, so check the current label. How we grade.
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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.