Products · Oral care · Dental Lace
Dental Lace Refillable Silk Dental Floss, Glass Container with Refills
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Silk floss with a plant-based wax in a refillable glass jar. Silk and plant wax are not the PTFE type, but “PFAS-free” is the maker’s word: we found no lab test, and the maker’s own FAQ admits silk can shred.
Best for People who want a plastic-free floss and can use silk, which can fray on tight contacts or sharp edges.
- Our quality rating
- Fair (3 of 5)
- Price range
- Mid-range
- Verified marks
- USDA Certified Biobased Product (100% biobased content)
- Size
- Glass jar with stainless steel cap and cutter; four 30-yard (27 m) spools, an 8-month supply by the maker’s count
approx. $18 with the jar and four spools
See it on Dental Lace’s site →We are not affiliated with Dental Lace. This link goes to the maker’s own page, with no tracking code. How we're funded.
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How we evaluated it
Why we chose it What put it on our list
- 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 maker says its supplier imports the silk cocoons from China and finishes the floss in Italy, and that the supplier is Seri.co certified.
- 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.
Trade-offs What to weigh before you buy
- We found no independent PFAS test. Dental Lace was not among the 39 products in the Mamavation and Environmental Health News lab screen (first published in 2022, updated in 2024). In that screen one silk floss, Wellnesse, showed low-level organic fluorine, while the silk flosses from Etee, Wowe and Bambo Earth did not.
- 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: the catalog’s PFAS line repeats the maker’s own statement. We found no public listing to check the maker’s “Seri.co” claim.
- The current owner has run the company since January 2025; it was founded by someone else. We saw no change to the product.
What to know Details worth knowing first
Many waxed “glide” flosses are coated with PTFE, a PFAS. A 2019 study of 178 women found that flossing with Oral-B Glide went with higher blood levels of some PFAS, and the floss itself tested positive for fluorine. A 2025 analysis of US survey data found a mixed picture, so the health effect is not settled. Silk with plant wax avoids the question. See our guide to avoiding PFAS.
Dental Lace sells 100% silk floss, thinly coated with plant-based wax and mint oil, in a refillable glass jar with a stainless steel cap. The refills come in compostable bags. The company says the cocoons come from China and the floss is finished in Italy.
The catch is proof. “PFAS-free” is the maker’s word here, and Dental Lace was not in the lab screen that cleared several other flosses. Silk can also shred on tight teeth, as the maker’s FAQ admits. If a lab result matters to you, Etee’s silk floss had one.
Quality & testing How it measures up against our checklist
| What we checked | What we found |
|---|---|
| PFAS-free floss Maker’s claim | The maker says “PFAS-free,” 100% silk and plant-based wax, and does not use PTFE. We found no lab test of this floss. |
| Every ingredient listed Maker’s claim | Silk, plant-based wax and mint essential oil. The wax is not named. |
| Honest claims Not verified | The FAQ says silk can shred or break. The page shows a “Dentist Approved” badge without naming a dentist or body. |
| Independent testing Not verified | Not among the 39 products in the Mamavation and Environmental Health News screen (first published in 2022, updated in 2024). We found no test of its own. |
| USDA biobased listing and B Corp status Verified | USDA’s BioPreferred catalog lists “Dental Lace Refillable Floss” (Dental Lace Inc) as certified 100% biobased; its PFAS line says no intentionally added PFAS “as reported by” the company. B Lab’s directory lists Dental Lace Inc as a Certified B Corporation since May 2024. |
| Seri.co silk supplier Not verified | The maker says its silk supplier is Seri.co certified. We found no public listing to check it. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Dental Lace Refillable Silk Dental Floss (glass container and refills): product page. Maker’s page. Materials, price and claims. Open ↗
- Dental Lace FAQ. Maker’s page. Silk origin, shredding, compost test and the vegan floss options. Open ↗
- 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 ↗
- 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 ↗
- 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. The article’s listed date is August 2024, but archived copies show the 39-product test online in September 2022. Open ↗
- 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 ↗
- 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 ↗
Alternatives Other options to compare
- Etee Peppermint Mulberry Silk Dental Floss Mulberry silk with candelilla wax in a glass jar, about $12 with two spools. A floss from this maker had no organic fluorine in Mamavation’s lab screen.
- 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.