There is a difference between extracting maxillary teeth and extracting mandibular teeth, which is mainly divided into the following aspects: firstly, anesthesia is needed before extracting the teeth, local infiltration anesthesia is generally taken for extracting maxillary teeth, and inferior alveolar nerve block anesthesia is mainly taken for extracting mandibular teeth, especially for posterior teeth of the lower jaw. Secondly, the extraction of maxillary teeth generally in the process of extraction is not particularly dangerous, from the important nerves, blood vessels are relatively far away, but in the extraction of mandibular teeth will take into account the direction of the mandibular nerve, the inferior alveolar nerve is located in the root side of the mandibular teeth, especially for the mandibular wisdom teeth or mandibular posterior teeth, the process of extraction, pay attention to do not damage the mandibular nerve. Thirdly, some of the maxillary back teeth are very closely related to the maxillary sinus position, so care should be taken not to involve this position, and the lower jaw generally does not have a relatively large cavity structure.