Since minimally invasive extraction is highly advocated in clinical practice nowadays, patients basically do not feel pain during the whole process of wisdom tooth extraction. Only when local anesthesia is injected can a slight pain be felt when the needle is inserted. Moreover, some hospitals now have special local anesthesia devices, which are computer-aided and controlled. Since the injection is done at a uniform rate, basically no pain is felt either. The extraction process also does not use more violent extraction instruments, such as bone chisels and hammers. Instead, a turbine is used to power the power system or an ultrasonic bone cutter is used to assist in the extraction, so nowadays wisdom tooth extraction is not very painful or painful.