In addition to our normal adult 28-32 permanent teeth, there are some extra tooth germ, multiple teeth are related to individual development, and several extra tooth germ grow during the development process. If multiple teeth are found, especially in children, they should be extracted as soon as possible, usually during the replacement of children’s milk teeth and permanent teeth, if the eruption of multiple teeth, sometimes parents find that the shape of the erupted teeth is irregular to seek medical attention, there are also multiple teeth buried, usually found during the examination of the film, especially the upper front teeth are more common. If the position of the supernumerary tooth is close to the permanent tooth, it will affect the eruption direction and position of the permanent tooth, and usually needs to be extracted as soon as possible.