Fillings are done to remove decay, and replace the affected tooth structure. It is called a filling because new a material fills hole that decay left. Now days most teeth are treated with bonded tooth colored composite resin fillings. You will be happy to know our office uses fillings that are tooth colored, metal-free, aesthetic and pleasing when you smile. Caught early enough, cavities can be treated easily, painlessly and are less costly . If not treated decay can lead to tooth pain and/or infection, and the tooth would need root canal treatment or extraction.