Yeah, teflon is inert. You only need to throw them away once you've burned the teflon, turning it toxic. Which happens at quite a low temperature. Btw the fumes that come off a burned teflon pan are incredibly toxic and will kill pet birds.
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Remarkably safe (for display purposes).
You would have to heat the teflon so hot that oil in the pan would burst into flame.
If you cook in such temperatures you must like eating charcoal.
I'm regularly heating pans to 650f and above for searing steaks, verified with a infrared thermometer. Also necessary for good stir fry.
You start with such high temps because unless cooking with an extremely high btu heat source, the temp of that pan drops dramatically once food is added. This is also why you don't add oil until right before placing your food item in. Otherwise, yes, even high temp oils would ignite before reaching 650f.