C.S.
Ice it as best you can. My daughter fell on her mouth at the age of one. She already had her front teeth and knocked them right back into the gum. I thought they broke off, but they were still there and fine. Her lip busted and the ER did give her one stitch. Months later her teeth came back down and then I was told to watch for them going grey or black. She sees the dentist every 6 months and she is now going to be five and he doesn't say anything about them. However, people have noticed her teeth are discolored. If anything, I would call a pediatric dentist and ask or take him to his PED. I am sure he will be fine.