If the patient is a child, i.e., a tooth occurs during tooth replacement between the ages of 6 and 12, and a small tooth grows next to it, there is a great possibility that the baby tooth is retained and the permanent tooth has erupted before the baby tooth has fallen out, in which case it is recommended that the parents take the child to a pediatric dentist and remove the baby tooth that has not fallen out. In the case of adults, the location of the tooth should be taken into consideration. If a small tooth is growing next to a tooth that occurs in the anterior region, there may be a case of multiple teeth. In this case, it is recommended that the patient go to the oral and maxillofacial surgery department for a CBCT to confirm the presence of multiple teeth and to extract them as soon as possible to avoid the possible occurrence of tooth-containing cysts or other inflammatory symptoms at a later stage. If there is a small tooth next to the last tooth in the arch, it may be a malformed wisdom tooth, etc. It is also recommended that the patient go to the Oral and Maxillofacial Surgery Department to take a CBCT to confirm this, and if it is a wisdom tooth, please extract it as soon as possible.