Three-year-old baby teeth corroded badly, indicating that caries has appeared, you can choose to fill the restoration, adjust the dietary structure, help children clean the mouth and other ways to improve. 1. Filling repair: three-year-old baby teeth after corrosion, the first carious tooth tissue clean up, and then according to the tooth caries parts and depth, choose the appropriate filling material to fill the tooth to prevent caries aggravation. If it is serious, root canal treatment is needed to be carried out after preformed crown restoration. 2. Adjust the dietary structure: usually let the children eat less sticky food with high sugar content, especially no sugar before going to bed, do not drink carbonated beverages, and strengthen the self-cleaning effect of the tooth surface. 3. Help children clean the mouth: after meals, parents promptly help children to clean up the food debris in the mouth to prevent bacterial growth and reduce the occurrence of dental caries. Three-year-old child teeth corroded badly, timely to the hospital, in the doctor’s advice to choose the best treatment program.