Dental Lace Refillable Silk Dental Floss, Glass Container with Refills

1. Ingredients 40% of the rating 4 of 5

   Three named materials, silk, a plant-based wax and mint essential oil, with no plastic, dye or sweetener, but the wax is not named.

2. Active ingredient 20% of the rating 3 of 5

   The maker’s own FAQ says silk can shred or break on tight or uneven teeth, and no outside trial compares it with other flosses.

3. Independent testing 15% of the rating 2 of 5

   We found no PFAS or other lab test of this floss; the USDA biobased listing, which the maker pays for, certifies plant content and not PFAS.

4. Trust 10% of the rating 3 of 5

   We found no recall, Prop 65 notice or safety lawsuit, but “PFAS-free” and the “Dentist Approved” badge have no source and a Certified B Corporation listing is about the company and not the floss.

5. Value 15% of the rating 4 of 5

   About $0.15 a yard ($18 for the jar and 120 yards), and refills cost about the same per yard.

The rating, 3.4 of 5, is the weighted average of these scores. See how we rank oral care and our standard.

1. 100% silk
2. Plant-based wax (type not stated)
3. Mint essential oil

• Paid certification USDA BioPreferred program (the maker applies and pays)

  Lists “Dental Lace Refillable Floss” as a certified biobased product with 100% biobased content. It certifies plant-derived content, not purity or PFAS: its PFAS line repeats the maker’s own statement. Open ↗ (opens in a new tab)

• Maker’s own test Dental Lace (statement on its product page)

  Says the floss is “PFAS-free”, 100% silk and thinly coated with plant-based wax. No test report is published, and the floss was not among the 39 products in the Mamavation screen. Open ↗ (opens in a new tab)

Does silk floss shred?

Yes, sometimes. The maker’s FAQ (opens in a new tab) says silk “can shred or break when dragged over sharp or uneven surfaces”, and points people with tight teeth to its polyester vegan floss. Reviewers on the product page say the same, including one who had a piece catch in the gums.

Is it really PFAS-free?

The maker says so and we found no test. Silk is not a guarantee: in Mamavation’s screen (opens in a new tab) the Wellnesse silk floss showed 14 and 22 ppm organic fluorine, while the Etee, Wowe and Bambo Earth silk flosses showed none. Dental Lace was not tested.

Is the silk ethically sourced, and is it vegan?

It is not vegan. The FAQ says the supplier imports cocoons from China, finishes the floss in Italy and holds a Seri.co certification, which we could not look up. It does not say whether the silkworms are killed. The maker sells polyester and plant-based vegan floss for people who object.

Is the “Dentist Approved” badge real?

The page shows the badge without naming a dentist, a study or a body, so we cannot confirm it. B Lab’s directory lists Dental Lace Inc as a Certified B Corporation since May 2024, which is about the company.

• The materials are simple and stated: 100% silk, thinly coated with plant-based wax and flavored with mint essential oil. That is not the PTFE (“glide”) type that a 2019 study linked to higher PFAS blood levels (see sources).
• The jar is glass with a stainless steel cap and cutter. Refill spools come in compostable bags, and the maker says it tested the floss at a commercial compost facility.
• The FAQ is candid that silk can shred or break on tight teeth, and it points those users to its polyester vegan floss.
• Refills cost about $9 for two 30-yard spools, so the jar is a one-time cost.

• We found no independent PFAS test. Dental Lace was not among the 39 products in the Mamavation and Environmental Health News lab screen, and one silk floss in it, Wellnesse, showed low-level organic fluorine.
• Silk can shred. The wax is called “plant-based” with no name given.
• USDA’s BioPreferred catalog lists the floss as certified 100% biobased, and B Lab’s directory lists Dental Lace Inc as a Certified B Corporation since May 2024. Neither is a PFAS test.
• We found no public listing to check the maker’s “Seri.co” claim.

1. Dental Lace Refillable Silk Dental Floss (glass container and refills): product page. Maker’s page. Materials, price and claims, seen 2026-10-23. Open ↗ (opens in a new tab)
2. Dental Lace FAQ. Maker’s page. Silk origin, shredding, compost test and the vegan floss options. Open ↗ (opens in a new tab)
3. Mamavation and Environmental Health News: 39 dental floss products screened for organic fluorine (first published September 2022; products added August 2024). Test report. An advocacy outlet that earns affiliate income. It used an EPA-certified lab, tested one sample per product (two for two products) and screened for total organic fluorine, not for named PFAS. Dental Lace was not tested; one silk floss, Wellnesse, showed low-level organic fluorine, while the silk flosses from Etee, Wowe and Bambo Earth did not. Open ↗ (opens in a new tab)
4. USDA BioPreferred catalog: Dental Lace Refillable Floss. Certifier or regulator listing. Search the catalog for “Dental Lace.” The entry shows biobased content certified at 100% and a PFAS line that is the company’s own statement. It gives 33 yards per spool; the maker’s page says 30. Open ↗ (opens in a new tab)
5. B Lab directory: Dental Lace Inc. Certifier or regulator listing. Lists the company as a Certified B Corporation since May 2024. This is a company-level certification, not a product test. Open ↗ (opens in a new tab)
6. California Attorney General: Proposition 65 60-day notice search (Dental Lace). Certifier or regulator listing. No notice naming Dental Lace found on 2026-10-23. Open ↗ (opens in a new tab)
7. Boronow et al. 2019: serum PFAS and exposure-related behaviors, including flossing with Oral-B Glide. Independent source. 178 women. Flossing with Oral-B Glide went with higher levels of some PFAS, and the floss tested positive for fluorine. Open ↗ (opens in a new tab)
8. Jiao et al. 2025: serum PFAS and dental floss use in US adults (NHANES). Independent source. Floss users had higher PFOA but lower levels of the other PFAS measured, so the picture is mixed. Open ↗ (opens in a new tab)

• etee Peppermint Mulberry Silk Floss Silk with candelilla wax in a glass jar, with no detectable organic fluorine in Mamavation’s lab screen. About $12 with two spools.
• Radius Vegan Sponge Floss Woven nylon with coconut oil and carnauba wax, about $5, with a clean result in Mamavation’s lab screen. Not plastic-free.
• Humble Co floss picks For people who need a handle. Plastic, but with a clean result in Mamavation’s lab screen.

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