The last tooth in the upper row is rotten and empty. If it is a wisdom tooth, it is usually recommended to be extracted. If it is not a wisdom tooth and can be retained after treatment, it should be retained as much as possible. 1. If the last tooth in the upper row is rotten and empty, it is generally recommended to be extracted if it is a wisdom tooth. On the one hand, wisdom teeth are mostly malpositioned and do not assume occlusal function. And the morphology of the development of large variations, treatment is very difficult. On the other hand, if wisdom teeth are difficult to clean on a daily basis, even after treatment, caries may reappear. 2. If they are not wisdom teeth and can be retained after oral treatment, they should be retained as much as possible. If the root of the tooth is intact and very strong, it can be restored with a crown after root canal treatment. The last tooth in the upper row is rotten and empty, it is recommended to go to the hospital in time, under the guidance of the doctor to give targeted treatment or treatment.