There is no best way to whiten teeth. Usually, you can consult a dentist, and after the doctor comprehensively evaluates the condition of your teeth, you can choose cold-light whitening, porcelain veneers and other options for teeth whitening treatment. 1. Cold light whitening: usually under the guidance of a doctor, the whitening agent containing hydrogen peroxide will be applied to the surface of the teeth that need to be whitened, and then irradiated with high-intensity blue light. It can make the surface of the teeth and the deeper layer of the colored material oxidation reduction reaction, so as to achieve the effect of whitening teeth. 2. Porcelain veneers: Porcelain restorative materials are usually affixed to the surface of the teeth that need to be whitened, so as to achieve the effect of whitening. This method can maintain the bone marrow, reduce teeth grinding, for teeth damage is relatively small. It usually lasts for a longer period of time, about 5 to 10 years. It is recommended to choose a regular dental hospital when whitening teeth.