Endodontists are dentists with at least two or three additional years of advanced specialty education in diagnosing and performing root canal treatments. Because they limit their practices to root canals (endodontics), they treat these types of problems every day. Endodontists use their specialized training and experience in treating difficult cases, such as teeth with narrow or blocked canals, or unusual anatomy. They may use advanced technology, such as operating microscopes, ultrasonics, and 3D digital imaging, to perform these special services.