A child’s teeth outside the gums is called retained milk teeth, which is caused by the fact that the milk teeth have not yet fallen out while the permanent teeth have already erupted, and it is recommended to go to the hospital stomatology department in time for extraction. When a tooth is found to be growing outside the gums, the first step is to remove the baby tooth. Before extraction, it is necessary to check whether there is any local infection, and if there is infection, it is necessary to wait until the inflammation subsides before extraction. After the removal of the retained baby teeth, if the erupted permanent teeth have been misaligned, affecting the normal alignment of the teeth, orthodontic treatment is needed. In daily life, attention should be paid to eating foods with moderate hardness to promote the timely loss of milk teeth and prevent the occurrence of retained milk teeth. At the same time, children should be trained to develop good hygiene habits, brush their teeth in the morning and evening, and eat less sweets and drinks.