Wisdom tooth extraction that injures the nerves, especially the mandibular wisdom teeth, may result in temporary or permanent numbness of the lips or cheeks, depending on the nerve damage. 1. Temporary numbness: When mandibular wisdom teeth are blocked, due to the deeper part of the blocked area, the lower alveolar nerve or lingual nerve may be injured during extraction, thus triggering numbness in the lower lip, gums, tongue side gums, tongue tip and other parts of the mouth, if the injured nerve is not completely severed, the numbness can be recovered gradually in about 2-3 months. In addition, if the anesthesia is not proper when removing wisdom teeth, it may damage the facial nerve and cause transient facial paralysis. 2. Permanent numbness: If the alveolar nerve or lingual nerve is permanently severed when wisdom teeth are removed, the damaged nerve cannot be restored, and the numbness caused by the damage may last for a lifetime. Therefore, in order to avoid damaging the nerves during wisdom teeth removal, CT or other imaging tests can be used to prepare for the localization before extraction.