Incisors, like other teeth in the mouth, can also occur decay, i.e. tooth decay, but the incidence of incisors is normally lower than that of the molars behind. The incisor caries is caused by bacteria, and the incisor caries usually occurs in the upper incisors, the incidence of lower incisors is obviously lower than the upper incisors, and it usually occurs in the adjacent area of the incisors, i.e. the gap between the teeth. When the incisors are embedded with food or not cleaned properly and bacteria are present, the caries will occur, and the adjacent area of the middle third of the affected teeth will be dark brown, which can be found by yourself when you look at the mirror, if the incisors are caries, you can consult the doctor timely and often fill the treatment. There are also some special people whose incisors will be decayed, such as people who take carbonated drinks for a long time, patients with gastric acid esophageal reflux, workers who work in acidic environment for a long time, etc. The common characteristic of these people is that the teeth are exposed to the acidic environment for a long time, and the whole teeth will be demineralized and decayed after a long time, of course, the incisors are also included, but the decayed parts happen on each tooth surface, in this case, we should avoid the teeth being exposed to the acidic environment for a long time and receive treatment in time.