Is Teflon safe to cook with?

Intact PTFE at normal cooking temperatures has not been shown to be the hazard. Heated above roughly 500F — which an empty pan on high heat reaches in minutes — the polymer begins to emit airborne degradation products that cause polymer-fume fever in people and kill birds. A scratched or flaking pan should be replaced because the coating is leaving.

Science News, summarizing studies conducted over forty years, reports that at high temperatures PTFE can emit airborne poisons, that the fumes can kill birds, and that people breathing the emissions can develop a flu-like condition called polymer-fume fever. The threshold commonly cited for meaningful breakdown is around 500F, with the veterinary literature noting emissions above roughly 280C (about 536F).

The documented human cases are striking rather than subtle. A 1964 paper in Aerospace Medicine described polymer-fume fever in 39 of 40 people on an aircraft where PTFE-containing insulation overheated. A 1975 Veterinary Record report described fume fever in a man alongside the death of five cockatiels after a PTFE-coated frying pan overheated. The pattern is consistent: this is an overheating phenomenon, not a normal-cooking one.

A bird's respiratory system extracts gases from air far more efficiently than ours, so the same exposure that gives a cook a headache can be lethal to a parrot. The published review of PTFE toxicosis in pet birds attributes most cases to overheated frying pans, with signs including open-beak breathing, loss of coordination and death — often within minutes.

If there is a bird in your home, ventilation is not the answer and neither is being careful. The answer is no PTFE in the kitchen, or no bird anywhere near it. The full explanation is here, and it is the single most actionable piece of information on this site for bird owners.

An intact, unscratched pan that has never been run dry and hot is a different situation from any of the above. If you are deciding whether to throw out a pan you bought last year and treat carefully, the evidence does not require you to.

1. Scratched through to a different color. The coating is leaving and will not stop.
2. Flaking. Today, not at the weekend.
3. Chalky or matte where it was glossy. The surface is breaking down.
4. It has been run dry and smoking. One severe overheat can damage a coating permanently even if it looks intact.
5. It is old and you cannot remember buying it. Coatings do not last indefinitely and there is no inspection that tells you how much is left.

Two routes. A ceramic-coated pan gives you non-stick without a fluoropolymer, at the cost of a replacement cycle. An uncoated pan removes coatings from the question permanently, at the cost of learning technique. Both are legitimate, and which one is right depends entirely on whether you would rather replace a pan or learn to preheat one.