There are many ways to repair tooth decay, which can include filling treatment, root canal treatment, or extraction depending on the severity. 1. Filling treatment, if the cavity is only minor and does not irritate the nerve of the tooth, you can usually choose to have a filling treatment, such as resin filling, which can effectively alleviate the symptoms of tooth decay. 2. Root canal treatment. If a more serious cavity has occurred, involving the nerve, it is necessary to carry out root canal treatment in a timely manner to remove the pulp and infected material, and then carry out root canal filling. 3. Tooth extraction, if the tooth has no value for retention, you can choose the right time for tooth extraction surgery. In normal life, you need to pay attention to oral hygiene, brush your teeth and rinse your mouth diligently.