When the upper incisors are lost, the permanent teeth do not grow, mainly because of the symptoms of premature loss of milk teeth, permanent teeth eruption or missing permanent teeth. 1. If the milk teeth are lost prematurely due to trauma or dental caries and the permanent teeth are not erupted, the permanent teeth will not be erupted for a long time, and no special treatment is needed to wait for the permanent teeth to erupt naturally. 2. If the milk teeth are lost and the permanent teeth have reached the eruption time but not erupted normally, the symptom of permanent teeth blocking the eruption will occur; it is necessary to consult the doctor for dental eruption aid surgery, which mainly includes removing the supernumerary teeth affecting the eruption of the permanent teeth and removing the gum tissues affecting the eruption of the permanent teeth in order to promote the normal eruption of the permanent teeth. 3. If there is a congenital absence of permanent teeth, no new teeth will erupt after the loss of milk teeth, and restorative treatment for missing teeth can be carried out to restore normal pronunciation or chewing function. If the upper incisors have been lost and no permanent teeth grow, it is recommended to consult a doctor for a clear diagnosis and symptomatic treatment to avoid delaying the condition.