Without knowing the amount of damage and how heavy the damage is, I've had some success with "popping" dents using a hair drier and a can of compressed air (one you'd use to blow the dust from you keyboard on a computer). Heat the medal with the hair drier get it good and worm. Quickly spray the area down with the compressed can of air. Should form a frost. Get a cup of coffee and watch the frost evaporate and watch for the "POP" . Contraction and rapped expansion within the medal has the potential to "POP" the dent back in place. There's "technical" video's on YOUTUBE on using this method.


Compressed Air Dent Removal - YouTube