If the tooth is rotten, you should go to the stomatology department of a regular hospital for an oral examination, such as taking dental radiographs, and then consider removing the remaining roots and crowns, root canal treatment, and restorative treatment after a professional dentist has made a diagnosis. 1. Removal of root and crown: If the tooth is completely rotten, a professional dentist should remove the remaining root and crown of the tooth to avoid infection. 2. Root canal treatment: If the tooth is rotten, but the root is long and there is no infection or other periodontal disease, root canal treatment can be performed to preserve the root. It is generally recommended to make a crown after root canal treatment. 3. Restorative treatment: after the extraction of rotten teeth, the missing teeth, but also timely restorative treatment, such as the installation of fixed denture or movable denture, etc., to maintain the integrity of the teeth, to ensure that the chewing function is restored. If the tooth is rotten, it is recommended to go to the stomatology department of the regular hospital as soon as possible for consultation and examination, and take timely treatment and restoration measures. Normally, you must pay attention to oral hygiene, brush your teeth on time every day, rinse your mouth before and after meals, and go to the hospital regularly to clean your teeth and protect your oral health.