Almost all of us have a non-stick frying pan at home that’s seen better days. Scratches, dull patches and food that doesn’t quite cook as well as it used to are all signs of a well-used pan. But non-stick pans tend to decline slowly, so you may not notice that your pan has had its day until it’s too late. But it is important you do keep an eye on them. The coating used on the non-stick frying pans is made from polytetrafluoroethylene (PTFE), better known as Teflon. It’s one of the most effective cooking surfaces because it heats up quickly, allows food to move around the pan easily and requires little to no oil. However, PTFE degrades with high heat and heavy use. Once it starts to break down, fragments of the non-stick coating can end up in your food.…