If you still have milk teeth at the age of 30, it is recommended to take a full-mouth film for examination, which is a curved tomogram, and then observe the condition of the teeth within the full jawbone. If there is no permanent tooth germ in the jawbone, it is possible that the baby tooth is congenitally missing and will not fall out easily. Once the baby teeth are lost, it is recommended to take implant restoration or choose to do three connected porcelain crown bridge restoration, which requires grinding the front and back teeth smaller before treatment can be done. You can also choose to do a movable denture restoration. If there is a permanent tooth germ in the jawbone that is misplaced or growing completely laterally, it may also cause a retention of the baby tooth, which can be left out if it does not affect the tooth. If the root development of the adjacent teeth is affected, the baby tooth can be extracted and the buried tooth can be removed and surgically treated. If the baby tooth can be retained, it can be chosen to be retained in place and left untreated, and then restorative treatment can be performed after it is lost.