When the root of a milk tooth breaks inside, treatment options such as removal of the broken tooth or retention for observation can be performed depending on the length of the broken root. Breast tooth root breaks inside, which usually occurs during the extraction of a baby tooth. When the root of a baby tooth breaks inside, the length of the broken root should be checked first. If the broken root is long, the broken root can be removed by prying slowly using a narrower tine. During the removal process, it is important to be gentle so as to avoid damaging the newly erupted permanent tooth. If the broken root is relatively short and difficult to remove, it should be kept for observation first. During the gradual growth of the permanent tooth, it may compress the broken root inside, and resorption of the broken root or crowding of the root on one side may occur; when the root is crowded on one side, it can be subsequently extracted again. During the extraction process, it is also important to keep the movements gentle to avoid damaging the newly erupted permanent teeth. When a child has a broken tooth root, the patient can be treated accordingly with the help of a doctor.