Incisors that is, incisors, incisors in the middle of white may be shallow caries, dental fluorosis, enamel calcification insufficiency, etc., as follows. 1. Shallow caries: Early shallow caries on smooth teeth are usually chalk-colored spots or plaques, which occur on the adjacent surfaces. 2. Dental fluorosis: usually caused by high fluoride content in drinking water, resulting in poor mineralization of enamel interstices and over-mineralization of enamel columns, mildly manifested as chalky plaques on the enamel of the erupted teeth in the same period, mostly seen in permanent teeth. 3. Enamel calcification insufficiency: enamel structural abnormality that occurs during tooth development, manifested as chalky damage with a smooth surface, which can occur in any part of the tooth surface. There may be other reasons for the whiteness in the middle of the incisors, so it is recommended to go to the hospital in time to clarify the cause of the disease and then carry out targeted treatment.