Dental microscopes have great advantages over ordinary microscopes in that they can provide 2-30 times magnification, have a good lighting environment, ensure the stability of the field of view, and advance root canal treatment into an era of “visualization”. Under this guidance, the doctor can clearly distinguish the transparent calcified material from the beige normal tooth tissue, use the root canal probe to find and probe the root canal opening, use the ultrasonic working tip and ultrasonic endodontic file to remove 1/3 of the calcified tissue inside the root canal, and then change hands to use the NiTi endodontic preparation instrument to prepare the remaining 2/3 of the root canal. During this process, the root canal is repeatedly lubricated and rinsed with EDTA solution, and once clear, it is disinfected and tightly filled, thus completing the treatment of the calcified root canal. Calcified root canal microscopic treatment technology greatly improves the accuracy of the surgery, breaks through the calcified root canal re-treatment technical problems, greatly shortens the diagnosis and treatment time, unblocking the root canal, root canal treatment from now on into a broader world!