Supernumerary teeth are abnormally developed teeth which are usually hereditary. They can erupt normally or grow towards the opposite direction, and are completely hidden inside the jaw bone. Supernumerary teeth usually appear in the area around upper front teeth. 　　 The consequences of having Supernumerary teeth: Disrupt the eruption of permanent teeth Delay the growth of permanent teeth Affect the position of the teeth Cause irregular alignment of teeth