Occasionally, a nonsurgical root canal procedure alone cannot save your tooth and your endodontist will recommend surgery. Endodontic surgery can be used to locate small fractures or hidden canals that weren't detected on x-rays or during previous treatment. Surgery may also be needed to remove calcium deposits in root canals, or to treat damaged root surfaces or the surrounding bone of the tooth. Endodontists use advanced technologies like digital imaging and operating microscopes to perform surgeries quickly, comfortably and successfully."