I actually never dent heads, sorry if I misled anyone, but I've used my set on open mic jams where other drummers use them and I tell them hey I just put new single ply heads on, don't dent them. Waste of breath. I agree, if you're denting them, you're doing something wrong. Now if I have to use my set in that kind of situation I change heads to the ones that got dented previously, and change back when I'm going to be the only one using the kit. Rebound is a beautiful thing