Inlays and onlays are dental restorations that are used as an alternative to full coverage dental crowns. These dental restorations offer a well-fitting, stronger, longer-lasting reparative solution to tooth decay. Inlays and onlays can also be used in place of dental fillings. While dental fillings are molded into place within the mouth during a single dental visit, inlays and onlays are fabricated in a dental lab before being fitted and bonded to the damaged tooth. An inlay restoration is when the material is bonded within the center of the tooth. An onlay restoration is similar to an inlay restoration except the extent of the damage requires inclusion of one or more cusps (the pointed portion of the tooth on the biting surface) on the tooth. Both inlays and onlays are highly durable and with proper care, can last for many years. Some reasons for needing these restorations include large, failing restorations, lost fillings or fractured cusps.