Best PFAS-free dental floss

The fiber has to be stated on the packaging or the brand's site. That single requirement removes most of the floss aisle, where products are described as "glide", "tape" or "smooth" with no material named at all — and where glide, historically, means PTFE.

We then preferred products that work on real teeth: silk for people who can use it, woven polyester for people whose contacts shred silk.

1. A named fiber. Silk, nylon, polyester. If the box says only "glide" or "tape", assume PTFE and look elsewhere.
2. The word PTFE or polytetrafluoroethylene, which is the thing to avoid if that is your goal.
3. The coating. Candelilla or beeswax on silk; coconut oil and wax on woven. These are not the issue.
4. Refillable packaging, if single-use plastic matters to you — glass dispensers with refill spools exist.
5. Not "PFAS-free" on its own, which is unregulated and uncertified. A named fiber is the stronger information.

The honest proportion here: the oral-health benefit of flossing daily is considerably larger than any plausible difference between fibers. If the only floss you will reliably use is the slippery PTFE kind, use it — a fluoropolymer strand you actually use beats a silk one you abandon because it shreds.

This is the same logic as the sunscreen you will actually wear, and it is worth saying on a site like this: the swap is easy and cheap, and it is not worth losing the habit over.

PTFE-based glide flosses, which are the product this page exists to replace. Any floss whose fiber is not named, which is most of the mainstream aisle. Flavored flosses with undisclosed flavor mixtures, since the FDA labeling rules that allow a fragrance or flavor to be declared in one word apply here too. And floss picks generally, which are single-use plastic by design and clean less effectively than a strand.