Is Teflon dangerous?
I had a quick look around pubmed, an aggregator of biological and medical literature, and found very little in the way of actual scientific evidence for teflon toxicity under 500C. In fact, teflon is still widely in use in surgery and can be left inside the body for tens of years.

This does not mean that improper operation (such as overheating to the point of thermolysis) cannot result in compounds you would rather not have in your food. It will also ruin the pan. Don't do it.