8-year-old girl tooth decay to do root canal treatment, depending on the severity of tooth decay to decide, it is recommended to go to the hospital in time for a detailed examination, and then according to the doctor’s guidance and recommendations for related treatment. 1. If the tooth decay is not serious and does not lead to inflammation, the tooth can be extracted if it is a baby tooth close to the replacement period; if it is a permanent tooth or far away from the replacement period, it is necessary to use a dental drill to remove the decayed tissues, disinfect and prepare the cavity, and then repair the tooth with special materials, pay attention to oral cleanliness, and generally do not need to do root canal treatment. 2. If tooth decay leads to inflammation of the tooth root, which affects the difficulty of eruption of permanent teeth and misaligned eruption, or infects the pulp, and pulpitis and periapical periodontitis occur in milk teeth, then root canal treatment is needed. It can completely remove the infected tissues in the pulp cavity, eliminate the infected pulp, reduce the chance of oral bacteria re-infecting the root tip, and prevent the infection from causing harm to the body. Parents are advised to pay attention to their children’s oral hygiene, avoid spicy, cold and other stimulating foods, and try not to chew food on the affected side to avoid loosening of the teeth, or inflammation and infection.