If your child’s permanent teeth have grown out and the milk teeth have not fallen out, you need to go to the hospital for examination and extraction of the retained milk teeth according to the situation. When a child’s permanent teeth grow out and the corresponding milk teeth don’t fall out, this is clinically called retained milk teeth, and the retained milk teeth need to be extracted in time to prevent the eruption space from being insufficient to cause malocclusion. Generally, we need to go to the hospital to take pictures to confirm whether the milk teeth are retained, and then extract the milk teeth under local anesthesia after diagnosis. For the ectopic eruption of permanent teeth, we can observe first, and if the teeth have not returned to the normal position after the completion of the replacement period, we need to consider orthodontic alignment of the teeth. Children need to pay attention to the eruption status of the teeth during the replacement period, so that problems can be detected and dealt with in time.