Hi, I cant seem to find the right info on the web, hope someone can help. My front tooth is broken and greying inside, smells pretty bad, so im sure its rotting or decaying, bust it does not hurt. Not sensitive.to hot or cold but does hurt if I lightly tap it. Gum around tooth is sensitive however and sometimes lightly bleeds. What do you think is wrong and what would be the best way to fix it? Thanks.