Join Date: Nov 2001
Location: Why, right here, of course!
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Bone and skin are organic, living structures. Teeth, aside from the inner pulp and the very, very small percentage of collagen in the dentin, are almost totally inorganic. That is, more like rock than like bone.
Bone and skin undergo continuous remodeling; teeth, in toto, do not. Once they're made, there they are.
There is a certain limited healing capacity to the pulp, and to the enamel (see the "remineralization" thread in the dental archives for more detail), but the dentin does not heal. Once the cavity has reached the dentin, it will continue to destroy tooth structure until it is removed.