The color of one's teeth can be altered in many ways. On one hand, surface stains can occur from using tobacco products, from consuming certain foods and/or from calculus and plaque deposits. On the other hand, teeth tend to darken with age. While external stains can be removed with scaling and polishing, the removal of internal stains requires whitening agents. In fact, a peroxide solution can be used to penetrate the porosities of the tooth and to brighten its very color. At the Tooth Doctors, we offer custom made whitening trays allowing a perfect fit and optimal results. They are reusable and can be worn again for touch ups as needed.