This condition is clinically known as retained milk teeth. Retained milk teeth can either fall out on their own by allowing the child to eat hard foods, or be extracted in the hospital. You should encourage your child to eat hard foods, such as nuts, and try to let them fall out on their own. If the baby teeth are already loose and affect the child’s chewing, it is recommended that they be removed in time. Especially the upper jaw lingering milk incisor must be extracted as soon as possible, so as not to cause permanent teeth anti-maxillary. If antimaxillary phenomenon has already appeared, it is necessary to closely monitor and correct it as soon as possible after the eruption of the front teeth. It is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.