The biggest possibility that there are small holes on the teeth is caries, which is related to dietary habits, poor hygiene and poor enamel development. 1. Dietary habits: If you usually love food with high sugar content, it is easy to increase the increase of caries bacteria, and the acid produced by them will cause corrosion on the surface of the teeth, thus forming cavities. 2. Poor hygiene: people who do not love to brush their teeth on time, due to food residues left in the mouth, providing favorable conditions for bacterial reproduction, over time will cause damage to the teeth, the formation of dental caries. 3. Enamel hypoplasia: in this case, the bacteria in the mouth will be more likely to invade from the gap in the enamel and cause damage to the tooth tissue, and ultimately form cavities, especially severe enamel hypoplasia, the surface of the teeth will have a band-like depression, which will further increase the chance of dental caries. It is recommended that when you find a hole in the tooth, go to the hospital dentistry in time, the smaller the hole is treated, the better the treatment effect you get.