Once your desired brightness level is achieved, you likely won’t need to touch up your smile for at least a year or even longer. This really comes down to your oral care and lifestyle habits. For example, if you smoke or drink a lot of coffee or wine, you may only want to wait six months or so before touching up. During your normal six-month checkups and cleaning with your dentist, feel free to ask them how your teeth are looking. They can tell you if it’s time for another whitening session.