Woa! Tooth damage from white strips?

I have a mold for my teeth from a dentist. In the US, the gel is prescription only, through a dentist. I'm unaware of it eating away your teeth. It can get painful, though, after two weeks or so of whitening with a powerful gel. Once whitened, you maintain a white tooth diet, cut down on the power level, and simply wear it while sleeping a few times a week. Never heard of damage from that.

Or from the whitener strips. How often were the strips used before there was damage? I purchased a box of strips. Now I'm hesitant to use them.

Been using Crest Write strips on and off as of late...didn;t know I should worry about the enamel. Also didn;t know I can't eat or drink dark colored food...goodbye diet coke..