Interesting. Does the jaw grow significantly from the ages of 5–10? Maybe that is why we lose them young and it has nothing to do with how long the tooth itself is supposed to last. I have no idea, just off the top of my head. I have heard that wisdom teeth frequently need to be pulled, because our teeth don’t all fit in out mouths anymore, supposedly a lag in evolution…but again, I really have no scientific information to substantiate what I said.