INBDE (Integrated National Board Dental Examination) Practice Exam

The mandibular 2nd premolar is most likely to have 1 root and 1 canal. Mandibular premolars typically have two roots: one mesial and one distal. However, the mandibular 2nd premolar often has one root and one canal, unlike the mandibular 1st premolar which usually has two roots and the maxillary premolars which typically have multiple roots and canals.