Detailed Instructions: Given the background description of some cooking related query, summarize the question into a title
Q: I use oil for cooking in the Teflon coated pan. I put the pan on a very low fire. (Simmer) Lately I have found that the onions get stuck to the bottom of the pan.How to know whether the teflon coated pan's life has reached end? Does it change colour or something else?
A:
How to know whether the teflon coated pan's life has reached end?