Endodontists specialize in the branch of dentistry recognized by the American Dental Association involving diagnosis and treatment of the neurovascular bundle (dental pulp) within the tooth. The word "endodontic" comes from "endo" meaning inside and "odont" meaning tooth. All dentists are trained in diagnosis and endodontic therapy, however, some teeth can be especially difficult to diagnose and treat. That’s why you have been referred to an endodontic specialist.
In addition to dental school, endodontists receive two or more years of advanced education in this kind of treatment. They study root canal techniques and procedures in greater depth, for diagnosis and treatment of more difficult cases. For this reason, many dentists choose to refer patients to endodontists.