When a child’s front teeth do not fall out and grow back, the front teeth (milk teeth) are usually extracted first, and the occlusion status of the teeth that grow back is observed; if the occlusion is not good, orthodontics is needed. When a child’s front teeth do not fall out and grow back, it belongs to the case of retained milk teeth, when the jawbone develops abnormally, and the permanent teeth at the back are not expected to top off the milk teeth. If the front teeth remain, it will affect the normal eruption of the back teeth, so the front teeth need to be extracted in time. After extracting the front teeth, the growth status of the back teeth will be observed to see if the bite of the back teeth is normal. If the bite relationship of the back teeth is not good, then orthodontic treatment should be considered. Parents need to pay attention to the replacement of the child’s milk teeth when the child’s teeth change, such as the occurrence of milk teeth should be taken to the dental hospital in a timely manner.