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My concern is the entire tooth out, or only part of it? Also when you state its half of his upper last molar, do you mean it's the last tooth in his arch? Basically I need to know how many teeth he has on the arch. If it's possible to submit a picture or two that'd be the easiest way for me to evaluate.
Ok, so I'm glad you were able to submit pictures that always makes things easier. Does he have the piece that actually fell out or broke away? I ask because that is the 2nd molar up there and that is a permanent tooth. It should not be coming out. I can see that there is a piece of tissue (operculum) that is covering and that is normal when a new tooth is erupting. So that tooth could just be coming in and only part can be seen (I can't tell on picture...is there is actually break away from that tooth). However, if he does know that a piece broke away from that tooth, then he needs to be seen by a dentist as soon as you can schedule to determine if there was early decay on that tooth, or it developed incorrectly and what can be done. Does that make sense?
Ok, yeah sometimes when that piece of tissue (operculum) sits on erupting tooth-especially teeth that come in slow, a cavity can develop underneath that tissue and could have cause the fracture. However that tooth could be not calcified properly (didn't develop correctly) and was weak and fractured because of that. The important part would be to have it x-rayed (Periapical and bitewing xray) to determine the extent of break, health of the nerve of tooth, and what can be done. Is there anything else I can explain or recommend for you?
No problem, take care. Dr. Hegland