> How would this result in the growth of a new tooth in the right spot? O I'd guess the same way teeth grow in the right spot to begin with. Stem cells somehow

> How would this result in the growth of a new tooth in the right spot? O I'd guess the same way teeth grow in the right spot to begin with. Stem cells somehow "know" (the mechanism wasn't fully understood the last I heard, but perhaps that's changed) where they are located in the body and what they should grow into. That's why you don't see babies with noses on their feet or whatever. Sure, once in a while something goes wrong and you get things growing where they shouldn't, but in most cases that doesn't happen.