A toothache from eating is, in most cases, a chronic pain from a disease, because acute pain will mostly be obvious spontaneous pain, while chronic pain, commonly under irritation. There are several common general etiologies that cause this symptom. The first and most common is chronic pulpitis, or chronic periapical inflammation, this type of disease due to the pulp and periapical itself is infected with inflammation, once the stimulation of chewing force, will lead to pain significantly or pain aggravated, this is the more common clinical occlusal pain situation. In addition to these two diseases, dentin sensitivity, clinically, may also lead to painful eating conditions. Dentin sensitivity, generally refers to the hard tissues of the dentition, due to excessive wear and tear, and the exposure of dentin and nerves, when chewing operations are performed, the exposed nerves are stimulated, which can lead to pain in the corresponding areas. Finally, diseases including some dental injuries may also cause painful eating, such as splitting of the tooth, or hidden fracture of the tooth, which can cause the symptoms of toothache during eating.