If you put metal in a Teflon (also known as PTFE) pan, you risk damaging the non-stick coating and potentially releasing harmful fumes. Teflon is a brand name for polytetrafluoroethylene (PTFE), a synthetic fluoropolymer that is commonly used as a non-stick coating on cookware.
The main concern when using metal utensils in a Teflon pan is that the metal can scratch and scrape the non-stick surface. Teflon coatings are not as hard as metal, so any metal utensils with sharp edges or rough surfaces can easily cause damage. Once the Teflon coating is scratched, it can lead to the release of toxic fumes, especially when the pan is heated during cooking.
The fumes released when Teflon is overheated can cause a condition known as "polymer fume fever," which is characterized by flu-like symptoms such as headaches, chills, and fever. This condition is generally temporary but can be quite unpleasant.
To avoid damaging the non-stick coating and potential health risks, it's best to use non-metallic utensils, such as silicone, wood, or plastic, with Teflon pans. Additionally, using low to medium heat when cooking and avoiding high heat settings can help prolong the life of the non-stick coating and minimize the risk of releasing harmful fumes.