Replacing existing crown before or after braces treatment?

Crown placed in Nov., the crown makes little to no contact with the opposing tooth. It's on #19. The crown is bulky but for the most part doesn't bother me. Except it hurts to floss on the mesial side of tooth. New dentist wants to redo crown due to poor contouring. I am getting braces now and both orthodontist and dentist want a new crown before starting braces. Don't most providers say to place a temp crown during braces? I don't want a new crown to get ruined during braces or mess up my bite.