extra teeth according to their location in your mouth: Mesiodens are the most common type of extra teeth. They grow directly behind your upper front teeth. Paramolars grow (erupt) next to your molars (toward your tongue or cheek). Distomolars erupt in line with (behind) the rest of your molar teeth. Supernumerary teeth also have different shapes, including: Conical (cone-shaped). Supplemental (an extra tooth that’s shaped like a typical tooth). Tuberculate (barrel-shaped). Odontoma (a harmless, noncancerous tumor that looks like a mass or an abnormally shaped tooth).