Dental Fillings In Naperville, ILDental fillings are used to fill cavities and repair cracked or broken teeth. Fillings can be done with gold, porcelain, or silver amalgam, but is most commonly done with materials called composite resin fillings that are designed to match the color of your teeth. Additional steps are required for tooth-colored fillings because it requires multiple layers and a special light to dry and harden the area around the filling.