A hole in the tooth can be caused by not paying attention to oral hygiene, dental caries or enamel hypoplasia. 1. Not pay attention to oral hygiene: daily not pay attention to oral hygiene, resulting in the retention of food debris on the surface of the teeth, breeding bacteria, erosion of the tooth, resulting in a hole in the tooth. 2. caries: may be the oral cleaning is not timely, the food debris retained on the surface of the teeth, in the role of cariogenic bacteria to produce acid, resulting in demineralization of tooth enamel, and gradually erosion of dental tissues, resulting in a hole in the teeth. 3. Enamel hypoplasia: mainly in the period of tooth development, due to the apical part of the root of the baby tooth is infected, nutritional supplementation is insufficient, dental trauma and other circumstances hinder the development of the teeth, resulting in the surface of the teeth have obvious substantial defects, the teeth rot a hole situation. If there is a rotten hole in the teeth, you should go to the hospital in time, give targeted treatment after clarifying the cause, and pay attention to oral hygiene in daily life.