Toothache itself does not cause disease. Toothache is a manifestation of a variety of dental and periodontal diseases, such as dental caries, acute pulpitis, acute wisdom tooth pericoronitis, etc. If not treated in time, the condition will further develop and even lead to teeth can not be retained and so on. 1. Tooth decay: Tooth decay is one of the common causes of tooth pain, due to the lack of attention to personal hygiene, resulting in the growth of bacteria, over time there may be tooth decay. If left untreated, the tooth will continue to decay and cause pulpitis. 2. Acute pulpitis: Acute pulpitis, also known as nerve pain, is caused by bacterial infection of the dental pulp. When the pain is very intense, be alert to the possibility of acute pulpitis. 3. Wisdom tooth pericoronitis: mainly occurs in young people, due to the wisdom tooth eruption is blocked, the gum tissue covered in the wisdom tooth performance to form a blind pocket, food debris will be accumulated in the pocket, the occurrence of bacterial infections and triggered. It is recommended to develop good oral hygiene habits in daily life, and to go to the dentist as soon as possible for early treatment when toothache occurs.