If your child’s teeth have not fallen out outside and new teeth are growing inside the gums, there may be retained milk teeth or supernumerary teeth, so according to the situation, you can choose to temporarily observe, extract the milk teeth or supernumerary teeth. 1. Temporary observation: when the new teeth inside are just peeking out and the outside teeth are not falling out, you can let your child eat some hard food to promote root resorption of the milk teeth and accelerate the loss of milk teeth, so that the permanent teeth will have enough space for eruption. 2. Extraction of milk teeth: The inside permanent teeth have erupted to the occlusal plane, but the outside teeth have not yet fallen off, in this case, the milk teeth need to be extracted. 3. Extraction of supernumerary teeth: If the teeth inside are supernumerary teeth, the supernumerary teeth must be extracted in this case, so as to prevent the permanent teeth from not erupting or erupting in the wrong position. Children’s teeth outside the gums did not fall inside the growth of new teeth in time to the hospital, after a professional doctor’s examination, a clear cause of the timely treatment, so as not to delay the condition.