This evening I checked one of my molars that has been in bad shape for several months now. A good chunk of one side has broken off. When I first noticed it, the side it had broken off of looked to be a huge cavity. I have looked at it a handful of times since then. Tonight I decided to give it another peek. To my surprise roughly 70% of the area that was black is now tooth colored again. I wish I had before and after pictures. What I wanted to know is there any documented cases of this happening?