In order to make teeth whitening, many people will use baking soda with toothpaste to brush their teeth, in fact, it is not recommended to use baking soda to brush your teeth for a long time, because baking soda is an alkaline substance, long-term use of which will make the acid-base balance in the mouth appear disturbed, and long-term intake of alkaline substances is not good for the health of the body. In the process of brushing teeth with baking soda only plays the role of friction agent, it is similar to the role of toothpaste, so it is not recommended to long-term use of baking soda with toothpaste to brush teeth. If there are indeed pigmentation and tartar on the teeth, making the teeth very unattractive, in addition to the usual serious brushing and rinsing, you also need to go to the hospital for scaling, scaling is through the ultrasonic scaling with the water spray rinsing method, can completely remove the pigmentation of the surface of the teeth and tartar, so as to make the teeth become very clean and beautiful. If the teeth are naturally yellow and dark or suffer from dental fluorosis or tetracycline, these patients need to do cold light whitening, taking cold light whitening method in order to change the color of the teeth, so that the teeth become white and beautiful.