I wonder how teeth regrowth would work? Our adult teeth don't "push out" like it seems, but our body "grows out and around" the adult teeth formed from early age (maybe even birth? I'm no expert). You can look up pictures of baby skulls where the adult teeth are visible deep in the bone; a baby's adult teeth are formed already, and located in the bone around the lower nose area, some almost on the side of the nose; the baby will grow into them.