Maria, My son knocked his tooth completely out at about three, and there was not much that could be done, per the dentist. She said that his permenant tooth would grow in when he was six. So he walked around for three years with a missing front tooth. Not comforting, I know. However I can assure you that if it did fall out (which I doubt). It'll grow back. My son's did. On a brighter note, my daughter (9 years old) knocked her front teeth, last week, and it was bleeding and loose. We took her to the dentist, the next morning, and it was xrayed. It was fine. The dentist advised that she should try not to bit anything solid with those teeth for 3 weeks so that it can reseat itself. So avoid giving him things that he can bite with front teeth for the three weeks. Try soft food, and he should be fine.