The common causes of toothache are deep caries, gingivitis, periapical periodontitis, periodontitis, and so on. 1. Deep caries: it means that the caries of the teeth has reached the deep dentin layer, close to the pulp or has affected the pulp, when it enters the cavity, the patient will be cold, hot, sour, sweet, etc., and produce transient pain, and after drinking alcohol, it will stimulate the nerve of the teeth, and the symptom of toothache will occur. 2. Gingivitis: non-specific inflammation of the soft tissues of the gums caused by plaque on the surface of the teeth, and drinking alcohol will stimulate the inflammation of the dental nerve and make the patient experience symptoms of toothache. 3. Periapical periodontitis: an inflammatory disease that occurs in the tissues around the root tip of the tooth, often secondary to endodontics, alcohol may enter the blood vessels to stimulate inflammation after drinking, leading to symptoms of toothache in patients. 4. Periodontitis: is due to the bacteria in plaque invade the periodontal tissues and cause chronic inflammation, alcohol may stimulate the root of the tooth after drinking, resulting in patients with symptoms of toothache. A drink on the toothache, should be timely to the hospital, ask the doctor to determine the cause of the disease, if necessary, the appropriate treatment, and at the same time in daily life should pay attention to oral hygiene, rinse after meals, morning and evening brushing.