No, that is incorrect. PTFE is not a PFAS (it's chemically related, but is not the same).
You are perfectly fine with PTFE dental floss - it has no reactive PFAS components in it.
You are perfectly fine with PTFE dental floss - it has no reactive PFAS components in it.
PTFE, the material, does not contain PFAS in bulk form.
That's the end.
Floss, as a product, could contain any number of compounds related to the manufacturing, packaging and coating.