The sequelae of tooth-containing cyst surgery depend on the location of the tooth-containing cyst, as follows: 1. If the tooth-containing cyst is near the inferior alveolar nerve or has invaded the inferior alveolar nerve, there is a risk that the surgery will damage the inferior alveolar nerve, resulting in lower lip numbness, which can be recovered in most cases. However, if the nerve is broken because of the surgery, there is a possibility of permanent lower lip numbness; 2. If the tooth-containing cyst is in the maxillary sinus or sinus position, there is a risk of maxillary sinus fistula in the surgery, that is, the oral cavity and sinus may form a channel of mutual traffic after the cyst is cut out. Of course like the risk of inferior alveolar nerve injury, if the nerve is already within the cyst, to protect the nerve usually may be performed pocketing, i.e. window decompression, instead of going to clean the cyst wall so that the nerve will not be damaged.