Yellow teeth with any toothpaste is not useful. There are probably two possibilities for yellow teeth: one is the teeth themselves, the color is yellow, if there are no other symptoms is also relatively normal, and does not affect the health of the teeth, can not do other treatment, the use of any brand and any effect of toothpaste want to whiten teeth by brushing is not any effect. If the patient feels that the teeth are not white enough to affect the beauty of the hospital to do cold light whitening, teeth brightness can be improved by about two shades. The other kind is caused by calculus attached to the surface of the teeth, for the formation of calculus, the texture is relatively hard, it is difficult to remove through normal brushing, so the effect of using any toothpaste is not obvious, it is best to go to the hospital for ultrasonic cleaning to remove the calculus.