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Inlays and onlays are two types of dental restorations that are used when there is decay on the natural tooth surface. The main difference between an inlay and onlay is whether or not the “filling” covers, or re-creates, the tooth’s cusps (tooth’s protrusions). Unlike traditional “fillings”, inlays and onlays are designed and crafted in a dental laboratory. This requires the use of temporary restorations and a second visit. The main advantages of inlays and onlays over traditional “fillings” are durability and improved protection against recurring decay.