There are many causes of pain at the root of the ear in the jaw bite, such as temporomandibular joint disorder, periapical inflammation, dental caries and so on. 1. Temporomandibular joint disorder: bad biting habits, bad oral habits and other behaviors can lead to temporomandibular joint disorder, so there will be pain at the root of the ear of the upper and lower jaw bite. 2. Periapical inflammation: pulp necrosis, stumps, etc. are not treated in time, the inflammation spreads to the root tip, resulting in the formation of periapical inflammation, the inflammation further invades the surrounding area, destroying the periapical tissues, resulting in swelling and pain, and pain at the root of the ear of the bite of the upper and lower jaws may occur. 3. Dental caries: Dental caries can lead to some changes in the pressure of the occlusion of the teeth, thus causing the pulp nerve reaction, which leads to the phenomenon of pain in the root of the ear of the upper and lower jaw occlusion. There are many reasons for the pain in the upper and lower jaw occlusion at the root of the ear, it is recommended to go to the hospital in time to improve the examination of the symptoms, under the guidance of the doctor to take standardized treatment, do not ignore the symptoms, take it lightly, so as not to lead to adverse consequences.