Crowns can be used to correct tooth color and alignment defects, as well as correct structural damage to individual teeth. This process is more invasive than getting veneers, but it provides more reliability when added bite-strength is required. Crowns come in 3 basic types: all-gold, all-porcelain, or a blend of the two. Gold is the most reliable and requires the least removal of tooth structure, but may not be the best cosmetic choice. For the best cosmetic choice, most people choose all-porcelain crowns. Sometimes an all-porcelain crown requires the removal of more tooth structure than the other type of crown, and it also has a higher risk factor for cracking. PBMs (porcelain bonded to metal crowns) provide a reliable cosmetic result while relying on the predictability of the metal for a tight seal. PBMs are currently the most common crown choice, but recent advances in all porcelain crowns are starting to change that.