However, in the case of pulpitis, especially acute pulpitis, the pain is very pronounced even without tapping the tooth, with typical spontaneous pain, nocturnal pain, pain that cannot be localized, and temperature stimulation pain. However, when the tooth is tapped, the tooth will be painful not as a typical manifestation of pulpitis, but as a typical manifestation of periapical inflammation, which develops further due to the development of pulpal disease, and the patient will have obvious throbbing pain after the formation of periapical inflammation, and the pain will be intense, and there will be intense pain when the tooth is tapped, so the percussion is mainly for the root tip, not for pulpitis.