The enamel has no luster may be enamel hypoplasia, dental fluorosis and other diseases, specific as follows. 1. Dental enamel hypoplasia: mild cases of enamel mineralization is incomplete, the form of enamel is basically intact, but due to poor mineralization, refractive index changes, its color and transparency changes, the formation of chalky enamel, generally no conscious symptoms. 2. Dental fluorosis: dental development and mineralization of excessive fluoride into the human body resulting in dental fluorosis, manifested in the same period of eruption of teeth enamel with chalky plaques, the teeth of the friction tolerance is poor. There may be other reasons for the lack of enamel luster, it is recommended to go to the hospital in a timely manner, after clarifying the cause of the targeted treatment.