The use of the surgical operating microscope in every treatment procedure. The combination of magnification and light allows the doctor to visualize the internal anatomy of the tooth during treatment, enabling him to locate, clean and fill extra canals and spaces which would most likely be missed otherwise. The microscope can also be used in conjunction with ultrasonic instruments to remove calcifications and other blockages which have the potential to make a tooth inoperable. The magnification is also critical in diagnosing the presence of cracks in the tooth structure and determining the extent of a fracture line, which is vital in determining the prognosis of a tooth. Overall, the use of the microscope during endodontic treatment greatly enhances treatment and helps ensure endodontic success.