Teeth appear “plaque”, you need to go to the dentist to confirm the specific nature of the plaque, including exogenous staining, endogenous staining and dental caries, and then carry out the appropriate treatment. 1, exogenous staining: taking dark-colored medicines, food, drinks, and oral cleaning is not in place, smoking and so on, can be caused by the tooth surface color pigmentation, it is recommended that you go to the dentist. Stomatology consultation, ultrasonic cleaning. Reasonable toothbrush design and correct brushing method can also effectively remove tooth surface pigmentation, slow down or reduce the occurrence of oral inflammation. Generally advocate brushing once a day in the morning and evening, you can use water floss, dental floss or interdental brush to clean the gap between the teeth; 2, endogenous staining: teeth erupt before the development of the mineralization period, the application of tetracycline drugs can lead to tooth staining. Apical periodontitis of milk teeth, calcium deficiency, trauma, excessive fluoride intake, etc. may affect the development of tooth germ, hard tissue formation, resulting in enamel hypoplasia, teeth appear black and yellow spots. Treatment methods include resin veneer repair, dental bleaching, porcelain crowns or porcelain veneer repair, etc., which can be selected according to the degree of coloring; 3, caries: teeth with caries can also lead to blackened surfaces, dark spots, at this time should go to the dentist for decortication and filling treatment.