Dental inlays are a method of dealing with tooth decay that can be used when a simple filling is not enough, but a more drastic method, like a complete crown is not necessary. They are placed on the grooves of your teeth to take care of cavities and are pre-molded to fit and keep your bite feeling natural.
Inlays are made of tooth-colored ceramic, porcelain, or a dental resin composite, so they look natural, too.