Very interesting...If tooth regrowth is a reality, I wonder if the small tubules would also regrow, or whether it would just be a layer of solid material such as calcium like Bex had alluded to? I know I just couldn't bring myself to yank out my crowns in the hopes of the tooth regrowing itself properly over a few years--not to mention the possiblity of further tooth damage since they have now been so worn away by the dentist before placing the crowns on them. Small filling holes though might be more of a possibility (?). Think for now I might have to put this idea on the back burner for a while, and see where it leads in the future. Very interesting food for thought though...