Yellow teeth are usually caused by plaque and tartar or the color of the teeth itself, the fastest way to remove yellow teeth are ultrasonic cleaning and cold light whitening, as follows. 1. Ultrasonic cleaning: If plaque or tartar causes yellow teeth, you can remove plaque and tartar through ultrasonic cleaning, and then polish the teeth, the yellow condition of the teeth can be improved to some extent. 2. Cold light whitening: If the teeth themselves are yellow in color, cold light whitening can be done, but the effect of cold light whitening is not permanent, it can be maintained for about 2 years, and it is necessary to pay attention to reduce the consumption of coffee, tea and other beverages that can cause hyperpigmentation. There may be other reasons for yellow teeth, if the yellow teeth are serious, or accompanied by other symptoms, it is recommended to go to the hospital in time, with the help of the doctor to clarify the cause, targeted treatment, such as veneers, crowns and other methods.