Teeth whitening methods, including ultrasonic cleaning, sandblasting, whitening drugs with cold light irradiation, as well as the application of bleaching drugs, etc., are as follows: First, ultrasonic cleaning: ultrasonic cleaning, removal of surface adhesion of the teeth of the smoke stains, tea stains, coffee stains, food residues and soft scale, etc., to restore the original color of the teeth. Second, sandblasting: sandblasting can be used to remove the teeth adjacent to the surface, as well as maxillofacial fossa and fissure point gap in the small stones, pigment. Third, whitening drugs with cold light irradiation: when the teeth are yellowish in color, the tooth surface can be disinfected, coated with hydrogen peroxide and other whitening drugs, combined with cold light irradiation, so that the teeth color quickly become white. Bleaching medication: When the teeth become yellowish after root canal treatment, the filling material can be removed and bleaching medication can be placed in the pulp cavity to make the tooth tissue whiter gradually.