99.6% single root (1-3 present) 91% single canal 92% single apical foramen Cleghorn Sept 2007 Lit review
Some of the more modern studies from the lit review saying about 14-30% 2 or more canals but only 5-20% with 2 or more canals at apex
3x view only of sectioned teeth India Singh 2014 JOE
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