Children with tooth decay, if it is a permanent tooth after tooth replacement, it is recommended to carry out filling treatment; if it is a milk tooth, generally can choose filling treatment or extraction, mild symptoms or milk teeth replaced within six months can be observed. Permanent teeth will start to erupt and replace at around 6 years old. If the decay occurs in permanent teeth, filling treatment is needed as soon as possible to prevent the disease from progressing; if the decay occurs in milk teeth and is about to be replaced in six months, observation can be considered for asymptomatic people, and extraction can be done for those who are symptomatic; if it cannot be replaced in six months, filling treatment or root canal treatment is needed according to the depth of the tooth decay. It is recommended to go to the stomatology department of the regular hospital, and choose the appropriate treatment plan according to the condition after examination by the physician.