Teeth too yellow can be whitened through scaling, sandblasting, cold light whitening, veneer restoration, crown restoration and many other ways, need to distinguish between different situations to choose different methods. 1. Scaling: teeth due to smoke stains, tea stains and other reasons lead to yellow color, can be ultrasonic scaling application of the principle of vibration to the pigmentation will be thoroughly cleaned up, so that the teeth to restore the original color, to achieve the role of whitening. 2. Sandblasting: For teeth that are yellowish due to chewing betel nut or drinking coffee, the teeth can be whitened by sandblasting. 3. Cold light whitening: Teeth that are yellowish due to endogenous color can be whitened by performing cold light whitening. 4. Veneer restoration: Teeth that are yellowed due to fluorosis, enamel underdevelopment and other problems need to be restored with veneers to achieve whitening results. 5. Crown restoration: For teeth with trauma, pulp necrosis and other causes of yellowing, you need to do root canal treatment, and then do porcelain crown restoration to whiten the teeth.