Dental inlays and onlays are restorations used to repair rear teeth that have a mild to moderate amount of decay or failing existing restorations. They can also be used to restore teeth that are cracked or fractured if the damage is not severe enough to require a full crown—conserving valuable existing tooth structure. Inlays and onlays are usually made from porcelain or gold. Because they can be created from tooth-colored materials, inlays and onlays are often used to replace metal fillings for patients who desire a more natural looking smile. They are conservative, esthetic and long lasting restorations.