Children with tooth decay are recommended to have filling treatment as early as possible, and root canal treatment is recommended when the nerve of the tooth is affected. 1. At the age of 2~6 years, children are in the milk teeth row, at this time, there are only milk teeth in the mouth; at the age of 6 years, the first permanent molar and permanent incisor erupt and enter the mixed teeth row, at this time, there are permanent teeth and milk teeth in the mouth. 2. For tooth decay of milk teeth and permanent teeth, it is recommended to carry out filling treatment as early as possible to avoid spreading to the pulp and causing pulpitis or apical periodontitis; for pulpitis of milk teeth, it is recommended to carry out root canal treatment as early as possible, as aggravation of the condition will affect the eruption of the succeeding permanent teeth and the development of jawbone; for pulpitis of permanent teeth, it is also recommended to carry out root canal treatment to avoid the condition being delayed, which will lead to the possibility of residual crowns or jawbone cysts, and so on. It is recommended to go to the stomatology department of regular hospitals for regular checkups and early detection and treatment.