Highest incidence of maxillary extra canal is seen in which tooth:

 # Highest incidence of maxillary extra canal is seen in which tooth:

A. Maxillary first premolar

B. Maxillary first molar

C. Maxillary second molar

D. Mandibular first premolar

The correct answer is B. Maxillary first molar.

The maxillary first molar usually has three roots with a single canal located in each root except with the mesiobuccal root in which a second canal may be present. With the use of magnification devices, the incidence of this canal is as much as >90%.