Types of white fillings include composite inlays and porcelain inlays and onlays. Inlays and onlays are used to restore teeth that are badly damaged by decay or wear. They may be applied to the chewing surfaces of the back teeth when esthetics are of concern. White fillings, like other dental materials, may require periodic replacement. If the edge of the filling eventually pulls away from the tooth, bacteria can get between the filling and the enamel and eventually may cause decay. Tooth decay over time may develop elsewhere on the tooth. Regular dental checkups are important because they allow the dentist to detect a problem in the early stage.