In this study, Classes IIA and IIB predominated in the impaction pattern of the mandibular third molar. Additionally, the presence of a dark line at the root apex on the panoramic radiograph indicated that the root of the mandibular third molar was frequently situated in the lingual cortical bone. It was observed that the concurrent narrowing of the inferior alveolar nerve (IAN) and the lingual driving pathway of the IAN in CBCT indicated a heightened risk of IAN injury. These two things happen at the same time, and doctors should tell the patient about the risk of IAN injury and the need to be more careful when pulling teeth.