It all depends on the teeth. If the teeth are restored with fillings or crowns and the restorations are dark, whitening or bleaching will not help because they don’t work on anything that’s not natural. In that case, we can fix the problem with a whiter restoration such as veneers, crowns or whiter fillings. But if the natural teeth are discolored or yellow, then the bleaching could be a way to whiten them. There are over-the-counter products and in-office or take-home treatments for teeth whitening; several options that need to be discussed with the dentist.