Normal teeth are lustrous and translucent light yellow, there are many reasons why teeth lose their luster, as follows: 1, human teeth with age and long-term use, will gradually mild color change, will gradually become obscure and lose luster; 2, due to exogenous pigment attached to the tooth surface, such as smoke spots, pigmentation covering the color of the teeth, so that the teeth appear yellow, gray, and Loss of luster; 3, teeth in the development process of abnormal, such as fluorosis, tetracycline teeth, enamel hypoplasia and other reasons to make teeth lose luster. After you find that your teeth have lost their luster, you should go to the dental hospital for examination and symptomatic treatment. For exogenous causes, ultrasonic cleaning or teeth whitening treatment can be carried out to remove the exogenous coloring, which is more effective and will not damage the teeth. For tetracycline teeth, fluorosis teeth, enamel hypoplasia, cold light whitening can be carried out to treat is a better choice, and if the teeth are seriously discolored and lose their luster and accompanied by tooth tissue defects, porcelain veneers or crowns can be considered to repair their luster and appearance.