A tooth that has grown underneath the tooth is a supernumerary tooth, which should normally be extracted and, if necessary, corrected with the aid of an orthodontic appliance. 1. A supernumerary tooth is a tooth that grows in addition to a normal tooth. The supernumerary tooth occupies a certain position in the bone, which will occupy the position and space of the normal teeth, making the teeth not well aligned, and because of the crowding around the supernumerary tooth, it is easy to retain food residues, causing dental caries and other problems, so the supernumerary tooth should be extracted in time if the physical condition permits. 2. If the supernumerary teeth have already caused the gap between the teeth to become bigger and the teeth are not well aligned, after removing the supernumerary teeth, orthodontic treatment can be carried out to correct the alignment of the teeth with the aid of braces. If a tooth grows underneath the tooth, you should go to the hospital in time and get standardized treatment under the doctor’s guidance.