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Yes, some dental floss brands have been found to contain PFAS, particularly those marketed as "glide" or "non-stick" floss. PFAS are used to make the floss slide more easily between teeth due to their slippery, water-resistant properties. Studies have shown that certain dental flosses may expose users to small amounts of these chemicals, which can accumulate in the body. If you're concerned, look for PFAS-free alternatives, such as natural or waxed floss, or check for brands that explicitly state they don't use PFAS.