Jaw pain may be caused by mandibular apophysitis, pericoronitis, ulcers, temporomandibular arthritis, maxillofacial gap infection, fracture, trauma and so on. 1. Inflammation of the root tip of the mandibular teeth will be accompanied by pus accumulation at the root tip or granulation tissue pressure underneath resulting in swelling and biting pain. 2. Pericoronitis is usually due to bacteria and food residues left in the blind pocket and localized infection, which usually occurs in the lower jaw. 3. Localized mucosa of the jaw produces ulcers, which can be painful due to necrotic material in the ulcerated mucosa. 4. Prolonged lateralized chewing may affect the temporomandibular joint disorder, with pressure pain and pain in opening and closing the mouth. 5. Interstitial infections in the jaw and face may cause fever, facial swelling and pain. 6. In addition, if the jaw is hit by external force, there are trauma, fracture, bone fracture and so on will also have pain manifestation.