I don't know why he's doing it. I think it makes him feel grown up to lose teeth. They were both wobbly, but I don't think ready. He is dc3, so I kind of know how it goes now. Any dentists out there? I know that the adult tooth "dissolves" the roots of the baby tooth, so presumably this will still happen if there are still some bits of root there. Can he actually do any harm by doing this?