If you have a cavity in a tooth, broken fillings, mercury fillings, or amalgam fillings, this type of dental filling is well worth discussing with your dentist. Mercury fillings or amalgam fillings can easily be removed and replaced with far more attractive colored fillings. These white fillings actually strengthen your tooth beyond the level it had with the amalgam fillings. Composite resins may also be used to enhance the appearance of any tooth, which is a tooth bonding procedure. The composite resin will strengthen and enhance the natural tooth structure as it does with use as a dental filling.