Root canal treatments are generally categorized into pulp inactivation, pulp extraction, and complete root canal treatment. Pulp deactivation is the process of opening up the pulp cavity of a tooth and placing some pulp deactivating medication inside the cavity to kill the nerve, which is commonly known as pulp deactivation when the nerve is killed. Pulp extraction can be performed under local anesthesia to remove the inflamed pulp directly, the doctor through some pulp extraction needle or special instruments, the root canal or pulp cavity to pull out the tooth, called pulp extraction. In addition, a thorough root canal treatment is performed after the pulp is extracted, the root canals are thoroughly prepared and cleaned, and finally, the root canals are tightly filled to seal the root canal system and prevent external bacteria and microorganisms from penetrating into the root canal system. Generally, patients with endodontics and periapical disease need to undergo root canal therapy for complete treatment. There are also cases where the tooth is missing for veneer restoration, and the tooth has to be ground down to a certain extent, which may damage the nerve, and endodontic treatment is needed at this time. There is also a situation where the tooth itself needs to be removed, but because of pain or physical reasons, the patient has high blood pressure, heart disease is not suitable for extraction, this time can also be relieved of the patient’s pain through root canal treatment. The role of pain relief through root canal treatment on worthless teeth can allow patients to temporarily not have to go to the extraction of the tooth, do not have to suffer from the possibility of producing some life-threatening factors.