The title used to post this article on HN is "Teflon found to be toxic, in class-action against DuPont" (not the original title of the article). However, I couldn't find any mention in the article of Teflon (polytetrafluoroethylene) itself being toxic. The article talks about the toxicity of PFOA (perfluorooctanoic acid), a chemical formerly used in the production of Teflon products. It also notes that people might have been exposed to PFOA if they had used Teflon products in the past. However, DuPont has since replaced PFOA with a less dangerous alternative.