Caries at the root of the tooth can be treated by restoration and filling, root canal treatment, extraction and other methods. 1. Restoration and filling: When there is caries at the root of the tooth, it is necessary to remove the caries firstly, and then carry out filling and restoration to prevent the scope of caries from further expanding, so as to restore the normal shape and function of the tooth. 2. Root canal treatment: If the scope of caries is large or deep, and has induced pulpitis, root canal treatment is required, followed by crown restoration. 3. Extraction: If the carious area has occupied most of the tooth body and the original tooth has completely lost its function, the tooth can be extracted. Patients are advised to pay attention to oral hygiene management and insist on brushing in the morning and evening. After the discovery of dental caries, go to the regular medical institutions for treatment in time to prevent further expansion of the scope of caries.