Your natural teeth will respond to teeth whitening products depending on their health and your attention to detail, such as brushing, flossing, and avoiding products that will re-stain your teeth. Crowns, bridges, and any inorganic materials used by the dentist to restore your teeth do not respond well to teeth whitening products leaving uneven colors. For example, if one tooth has a crown, it may be a different color than the surrounding teeth after using teeth whitening products. Consult with your dentist to determine the best solution to obtain better, consistent results.