If there are white things on the teeth, if there are scattered plaques or spots on the teeth, the possible causes are congenital enamel dysplasia and tooth decay, as follows: First, congenital enamel dysplasia: it will lead to white stripes, or yellowish-white spots or plaques on the tooth surface of several teeth in the mouth. Second, tooth decay: white stuff on teeth may also be superficial tooth decay, which is common in poor oral hygiene, or people who prefer to eat sweets and carbonated drinks, causing different degrees of acid erosion of tooth enamel, resulting in chalky white demineralized enamel surface on teeth. If the white spots or plaques on the tooth surface are small in scope and number, they can be restored by local grinding and filling with resin to restore the aesthetics of the tooth. If a large area of demineralized or defective enamel is present, which is very aesthetically displeasing, it is recommended that the tooth be restored with porcelain veneers.