The tooth is same colour as the rest of the teeth, but doesn't react to cold test... It is one of the most dislocated ones, therefore will need to be moved to fit into it's place nicely. It is a front tooth too, therefore I want to avoid root canal treatment if possible. Please advise if dead teeth when moved always get infected, discoloured or cause any other problems? Should I just leave it and see how it goes with Invisalign, or you recommend treatment prior straightening?