To treat a cavitiy , Dr. Lee removes the decayed portion of the tooth and then will “fill” the area where the decay was removed . Fillings are also used to repair teeth that are worn down from grinding or cracked from misuse .Both the pain and expense of this service can be avoided by routine check ups and cleanings. Today, several filling options are available. The most used is called a composite resin filling. This material matches to the shade of your tooth, giving it a natural look.