<unk> s is a condition found in teeth when there may be a larger number of<unk> s than expected. The most common teeth affected are mandibular (lower) canines, premolars, and molars, especially third molars. Canines and most premolars, except for maxillary (upper) first premolars, usually have one<unk> . Maxillary first premolars and mandibular molars usually have two<unk> s. Maxillary molars usually have three<unk> s. When an extra<unk>  is found on any of these teeth, the<unk>  is described as a<unk> . The clinical significance of this condition is associated with dentistry when accurate information regarding<unk>  canal anatomy is required when<unk>  canal treatment is required.
Supernumerary root
Neural clique
Naegele obliquity
Condylar hypoplasia
Midline cervical cleft
Regional odontodysplasia
Binaural fusion
Tooth fusion