I have a copper water pipe which has a mild kink in it, very similar to this photo, not even quite as severe:
It is hard copper.
The kink itself is not causing any problems but in the future I may need to do some work in this area and I'm concerned that it might make working with fittings near the kink difficult, especially since the pipe may need to be cut back a bit closer to the defect.
Obviously one option is to replace the kinked section, and that might be the best course of action.
But is there a method to attempt to restore the correct shape of the pipe? This seems worth at least trying first before taking on a much more laborious replacement. Especially if there is, say, a $15 special tool or something that could do the job and save a few hours work.