When tooth structure is lost due to decay or fracture, it can be replaced with a resin restoration, also known as a filling. The newest tooth-colored composite resin fillings are bonded to your teeth, helping to support and rebuild the tooth structure. Some resin fillings can also release fluoride over a period of time to help prevent recurrent cavities under and around the edges of the filling. Resin fillings can be matched to the natural color of your teeth, making them virtually invisible. Tooth-colored filling material helps your smile look its best! Amalgam (silver) fillings are only used when a resin filling will not work. The Dentists South Shore does not recommend having your existing silver fillings replaced unless necessary.