The reason why the process of tooth extraction is painless is because of the local application of anesthetic drugs. As an invasive operation, tooth extraction is now advocated as a painless treatment, and basically all tooth extraction operations are performed under anesthesia, especially when extracting complex teeth, especially mandibular wisdom teeth, the application is the block anesthesia of the inferior alveolar nerve, and this anesthesia can make half of the tongue, half of the jaw and the lower lip of the lower jaw anesthetized. The clinical anesthesia effect is so ideal that even if the patient has slight pain during the extraction, after explaining to the extraction doctor, the doctor will increase the dosage of anesthesia at his discretion to ensure that the extraction operation is carried out without pain, so nowadays all the extraction operations are carried out under anesthesia and of course no pain is felt.