Every tooth is alive and well, and no tooth is the same color for life. The causes and treatment of yellow teeth include; if poor oral hygiene caused by food residues in the surface layer of the teeth to form soft scale, usually including dental plaque adhesion, dental calculus, tea stains, tobacco stains, etc., the removal method can go to the regular dental hospital to do dental scaling, including ultrasonic scaling, sandblasting teeth whitening, etc., to remove the surface dirt also teeth original color, the subjective feeling is that the teeth immediately become white; then if the yellow plaque teeth, fluoride If the color of teeth is abnormal due to yellow spot, fluoride, tetracycline, enamel hypoplasia, tooth decay, dead pulp, staining, etc., the teeth can be whitened by cold light whitening, laser whitening, bracket whitening, etc. These methods are expensive, complex, cumbersome, and require a certain amount of time and process. The color of teeth itself is mixed color, no tooth color is pure white, teeth whitening is important, but the health of teeth is more important, unnecessary to deliberately pursue white, as long as the teeth are healthy, teeth whitening methods include physical and chemical methods, it is recommended that you treat them differently.