First, it is suggested that patients use whitening toothpaste, which can reduce the recolor of food after cold light whitening.

Second, the usual diet should also minimize dark food, pay attention to oral hygiene, pay attention to brushing your teeth and gargling in the morning and evening, and keep your mouth clean.

3. Within 24 hours after cold light whitening teeth, teeth are easily contaminated with colored substances. It is necessary to avoid drinking tea, coffee, cola, red wine, berry drinks, colored toothpaste, mouthwash, etc. Eat dark food and avoid smoking.