My son had a cavity in a back tooth, and the dentist assured him that the pain he was feeling was due to the nerve dying and that he would be fine. For the time being, she did not fill it. He had tooth pain last night, though it wasn't as bad as it had been a few weeks ago. He awoke this morning with half of his face swollen and a completely different face. I'm just waiting to call the dentist. I've never heard of child abscesses, and I've never had one myself, so I'm not sure what causes them. Do they simply give him antibiotics or do they need to extract the tooth? Could you please tell me about your experience?