Before and After Teeth Whitening Whitening sessions can be done every other day until desired results are accomplished. If you experience sensitivity or gum irritation, discontinue use for 3-5 days and try again. It is recommended to do touch up whitening sessions twice a month. After Whitening: You should give your teeth a chance to recover before consuming food and beverages that may stain your teeth. You may want to wait at least 36 hours to consume food or beverages that may stain your teeth, such as coffee, tea, green tea, wine, etc.