The idea of undergoing a root canal makes some people hesitant to make a trip to the dentist. Yet, the procedure has likely been done for thousands of years. Egyptian soldiers have been found with evidence that they had something like root canals. The treatment has lasted because it is a way to help maintain natural teeth, which experts say is best for patients. This week on “Take Care,” endodontist Dr. Linda Levin sheds some light on the procedure that she likes to call a therapy, what it