There are at least a dozen ways you can whiten your teeth. Your dentist can do it. You can use special toothpastes. You can buy and apply whitening kits from the stores. Yet, you probably have not tried the one method that prevents teeth from discoloration in the first place, and which may even whiten your teeth longer. Eating certain foods and not eating other foods is a sure-fire way of keeping and making your teeth white.