Generally, wisdom teeth are not good to pull out when they are left with a big hole after rotting. The brittleness of the tooth makes it more difficult to extract when the wisdom tooth is rotten and empty. Often it is necessary to divide the wisdom tooth into several parts and remove them in stages. If the wisdom tooth has very little crown exposed, the gums need to be cut open to remove the alveolar bone before the wisdom tooth can be extracted, and the alveolar nerve may be injured during the extraction process, causing complications. Wisdom teeth are located at the end of the tooth row and generally do not perform chewing functions. However, if it leads to pulpitis, it may lead to severe pain and seriously affect normal life and work. It is recommended that wisdom teeth be extracted in a timely manner after they have rotted and left a large hole. If they are not removed in time, the crown will be partially or completely covered by the gum flap because the mandibular wisdom teeth cannot erupt completely, resulting in the formation of a blind pocket between the gum flap and the crown. When food is embedded in the blind pocket, bacteria will grow, which can cause wisdom tooth pericoronitis when the systemic resistance decreases.