Root canal Anatomy Mandibular Premolar 98% single root (1-4 present) 76% single canal 79% single apical foramen.  Very high racial variances Cleghorn May 2007 Lit review Second premolars are more likely to have 1 canal (nearly all) leaving the first premolar more likely to have 2 canals (22%). Three canals are very rare less than […]