A tooth-colored filling material is used to restore a tooth with decay. Instead of expanding, a composite filling shrinks, which is overcome by layering of the composite. Our office prefers to use composite because the composite is bonded or glued into place, therefore, we do not have to undercut the tooth or over-prepare the tooth. Composites are more expensive than amalgams, due to the additional materials and additional time needed by the dentist to ensure they are placed properly. Composite cannot get wet during placement, which can make them difficult to place in very deep areas or in the presence of bleeding.