In general, for a normal growing tooth, there is no significant toothache after extraction. If the toothache is very obvious after tooth extraction, there are several possibilities: the first one is that the tooth is buried. The gums and alveolar bone are damaged during the extraction process, and it is possible that the local soft tissues will swell and swelling will occur after the extraction. The second kind, if the tooth has chronic inflammation before the extraction, it is possible that the local inflammation is not eliminated after the extraction and an acute attack occurs, and the pain is more obvious at this time, and there is a possibility of swelling and suppuration. Thirdly, if there is no pain within 3-4 days after tooth extraction, however, there is a sudden and severe pain in 3-4 days and the radiation causes pain on the same side of the head and face, it is likely that dry socket has occurred. Dry socket is a bacterial infection that needs to be treated as soon as possible by scaling the alveolar socket.