Neither DrTung's Smart Floss nor our Activated Charcoal Floss are made from PTFE – the floss material implicated by USA Today as being potentially toxic – nor are they intentionally treated with PFOAS, PFAS, PFOS, APFO and/or fluorine surfactants. Multiple tests done by DrTung's at an EPA-approved lab show that the amount of organic fluorine in our floss (said to reflect PFAS) is below the detectible range. PTFE material, although used widely for floss because it slides up and down easily between teeth, is also the worst performing floss as far as plaque removal goes. (See our study comparing Smart Floss to Glide and other flosses).