Written by Siju JacobApril 12, 2020 Mandibular second molar: 3-2-1 combo This Mandibular second molar started off as 3 canals merging into 2 and finally exiting as a single portal of exit. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Like Loading... Related Leave a comment Cancel reply Δ