Occasionally you may read a journal article or receive a report from our office stating that a certain tooth has an ‘apical delta’. What is an apical delta? Essentially it is just a very complex form of a lateral canal where one main canal branches in many apical exits. You may have heard the term before regarding the end of a river forming a delta [https://en.wikipedia.org/wiki/River_delta]. Here is a clear example of an apical delta for your viewing pleasure!