There are reasons why children’s teeth move, such as the replacement of milk and permanent teeth, and the permanent teeth come in before the milk teeth fall out. When it is active, it may hurt when eating. For loose teeth caused by inflammation of the root tip, it also hurts when eating. However, in the case of chronic inflammation, there is no obvious pain, and it may be a little uncomfortable when eating, but there is no obvious pain. Therefore, not all loose teeth are painful, and in these cases the doctor will make a differential diagnosis. In the case of retained milk teeth, the milk teeth will be extracted; in the case of acute inflammation caused by root canal treatment or drainage to eliminate the inflammation; the slow loosening of the tooth will be relieved and may be cured by treatment. For loosening caused by chronic inflammation, the doctor will use X-rays to identify the extent of the lesion on the tooth’s root tip and the effect on the permanent tooth germ to decide the next step of treatment.