If your doctor has recommended a crown to you, it is either likely to correct a broken tooth or to repair a tooth that has deteriorated due to cavities (decay). The decay in your tooth eats away healthy tooth structure much like how rust eats away at metal. If not removed by a dentist, decay will deteriorate the tooth to the point where extraction is the only viable treatment option. Sometimes, decay is removed leaving healthy tooth structure, but not much of it. A crown can then be placed, restoring the look and function of your tooth while allowing you to keep your natural, underlying tooth structure. Most crowns are precision-milled porcelain or full metal (gold or silver) and are individually customized for each application in each patient, giving you a natural, long lasting smile.