There is some evidence that over-the-counter bleaching products do whiten teeth, however, many of the products are too abrasive and can damage the teeth with extended use or misuse. Supervision by your dentist is always the safest and most effective way to whiten your teeth. The best dentist for teeth whitening will teach you how to whiten your teeth safely with over-the-counter products if you are not interested in teeth whitening in the office.