This is a bit of a tough one, heating brass doesnt do a great deal to soften it and if over heated can even make it weaker. If the teeth are that bent then they will almost certainly break off when you try to straigten them and even if they dont there is a good chance they will be so weak they could break off once the clock is wound and running. You have two choices, cut a new barrel wheel and solder it on or cut out the section with the broken teeth and solder in a new piece of brass and re cut the two missing teeth. If you dont fancy either of these methods then your only hope would be to find a donor.
Sorry I dont have better news for you on this