Maxillary first premolars and mandibular molars usually have two roots. Maxillary molars usually have three roots. When an extra root is found on any of these teeth, the root is described as a supernumerary root.
Maxillary first premolars and mandibular molars typically have two roots, while maxillary molars usually have three. When an additional root is found on any of these teeth, it's referred to as a supernumerary root.