The innermost teeth can of course be extracted, in fact all teeth in the mouth can be extracted, but before extracting a tooth it is necessary to check whether the tooth has indications for extraction, because every tooth is in fact very important, all permanent teeth once extracted will never grow again, especially for functionally important teeth, after extraction must be restored, and the last tooth should be identified The last tooth must be identified as a wisdom tooth or not. Wisdom teeth, professionally called third molars, are the last teeth to erupt and start to erupt around the age of 18-25. Since the oral jawbone is already developed at the time of eruption, and since the food people chew nowadays is getting softer and softer, the relative jawbone cannot accommodate the eruption of all the teeth, the last erupted wisdom teeth often appear to erupt ectopically. For ectopic eruption of wisdom teeth, it is recommended that they be extracted as soon as possible because if they are not removed, a series of problems may occur.