Inlays and Onlays are good options to restore the structure of your teeth. Inlays can be used to treat more than the surface and can treat some internal damage to your tooth, while onlays treat the surface. These treatments can be referred to as “fillings on steroids”. While that sounds aggressive, inlays and onlays are far less invasive than crowns which aim to replace most of the existing tooth. Inlays and onlays preserve most of the tooth and only replace the parts that are damaged or decayed.