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When PTFE is overheated, it releases fumes that are very toxic to birds and less toxic (but still toxic) to humans. No solid compounds are released. There are usually two layers below PTFE - mid-coat and primer. There is little information available about what substances are they and whether they are safe, but it seems logical that any reasonable company uses as safe compounds as possible. Below the coating is some metal. If the pan is so damaged it is visible, its safety depends on whether this metal is safe for food contact.

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