Sharks lose up to 30 000 teeth in a lifetime. They replace every single one of them, and no shark goes through life with missing teeth, because the moment a tooth goes missing, a new one pops in form behind it. The shark has something called a tooth whorl, which is like a snail shell with teeth coming out of it underneath the gums. This allows for infinite tooth regeneration. It now seems that the matrix of genes that are responsible for this kind of tooth regeneration is present in humans as well. The implications are staggering. Let me break it down for you.