A 10 year old child who has lost half of his teeth needs a comprehensive judgment based on the type of tooth, the state of the tooth, and can be treated with fillings and extractions. In a 10-year-old child, the milk teeth are not completely lost and the permanent teeth are not completely grown. If half of the milk teeth have fallen out, this can be treated by extracting the remaining teeth so that the permanent teeth can grow in smoothly. If half of a normal baby tooth has fallen out, the tooth cannot be extracted at this time because the permanent tooth will not grow out quickly, and root canal treatment can be performed to preserve the baby tooth. If half of a normal permanent tooth has been lost, a filling or root canal can also be done. A 10-year-old child who has lost half of his teeth should go to the hospital in time, choose the appropriate way of treatment under the doctor’s comprehensive assessment, and avoid unauthorized medication or treatment.