Root Canal Lower Molar First WF 33 Root Canal Lower Molar First 1 mesial canal, although it was ribbon shaped at pulpal floor. Angled can kind or see where ribbon portion canal is Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X CanalPro Irrigator by Coltene June 2012 How long does a dental crown last?