Smoke detectors

I have a trigger-happy smoke detector. Anytime I make toast the detector goes off – beeping and screeching until I pull the broom out of the closet and poke the ceiling hitting the silence button. It’s just like an upset baby with that hush button. After I hit the button the detector whimpers every 30 seconds for 10 minutes just to make sure I can still hear that it is upset. Yesterday however the detector failed me. I was cooking something on the stove and forgot it was there. By the time I remembered about half of my dinner had become charcoal. Where was the detector then? Slightly toasted bread is a red alert, but food burning to a crisp is a-ok.