Lower teeth, the right side of the innermost pain may be caused by pulpitis, wisdom teeth pericoronitis, apical periodontitis, and so on. 1. Pulpitis: caries to the pulp of the internal spontaneous pain, the patient will appear in the lower teeth, some patients will be accompanied by the face, the head of the radiating pain. 2. Wisdom tooth pericoronitis: when the wisdom tooth eruption is blocked, coupled with the body’s resistance to decline or bacterial virulence, the balance between the body and the bacteria is broken, resulting in patients with the phenomenon of the inner most pain on the right side of the lower teeth. 3. Apical periodontitis: the right side of the lower teeth inside the pain may be caused by apical periodontitis, the more common phenomenon of toothache, biting pain, gums pus, and so on. It is recommended that patients go to the hospital in time, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment.