The last molar in the left jaw may be the second molar or the third molar (wisdom tooth). If the second molar is extracted, its appearance and function can be restored through prosthetic restoration, while if the third molar is extracted, restoration is usually not necessary, as follows. 1. Second molar extraction: the second molar plays a key role in daily mastication, and should be restored as soon as possible after extraction, so as not to cause displacement of neighboring teeth or elongation of the opposite jaw teeth, which may affect the normal occlusal relationship. The restorations available include implant denture, partial denture and so on. 2. Third molar extraction: most of the third molar is blocked, after extraction, it has less impact on the chewing efficiency and the arrangement of the other teeth in the mouth, so it is generally not restorative treatment. It is recommended to go to the hospital to receive professional treatment.