Ooo, I am so sorry, that must have freaked you and him out. I still shudder when I think about my 5 year old walking up to me screaming and blood/drool covering her whole front red. My daughter ripped out her 2 front teeth on a moonwalk after she somehow bit the netting while jumping. I called 911 since I just did not know what to do, but they seemed only concerned with if she had passed out or hit her head, which she didn't. We went to the dentist who said that if the whole root was still there he could re-insert it (the root was already getting re-sorbed into the permanent tooth in the gum above it). However, with a 2 year old there might be a risk of choking if you were to insert a loose tooth. I would see the dentist to make sure nothing in the gums is damaged (we went to make sure the permanent teeth that were still in the gums were OK and they were). Apart from that, and the possible spacer to prevent other teeth from "tipping over" into the open space, there is not much to be done. My daughter had a nice gap-toothed smile for about 6 months when finally her permanent teeth started to come in. Yours will have a gap for a lot longer.