If the cavity is hollow and flesh is exposed, firstly, take a root apex radiograph, and then, according to the situation, choose root canal treatment followed by crown restoration or tooth extraction. 1. Crown restoration after root canal treatment: If the tooth is decayed but the root has not been resorbed, root canal treatment can be performed on the tooth first. After two weeks of observation after the root canal treatment, if there is no pain in the tooth, then crown restoration will be performed to restore the function of the tooth. 2. Extraction: If the tooth is rotten and exposed, the root of the tooth is resorbed and it is not meaningful to keep the tooth, it is better to extract the tooth in this case. In this case, it is better to extract the tooth. After extraction, according to the alveolar bone condition and your own financial situation, you can choose dental implant restoration or other denture restoration. If the tooth is rotten and exposed, go to the hospital in time to determine the best treatment method after examination by a professional doctor.