Many dental flosses are literally strands of ptfe and some studies correlate using them with higher blood concentrations of pfas.

Many “compostable” paper food and drink containers are lined with a ptfe film, which does get into the food.

Okay sure maybe it’s all leftover pfas reagents, (or maybe some break down but ignore that) it’s impossible for anyone to know that this particular instance of ptfe doesn’t have residual pfas.