In bonding, a resin material is cemented to the front of the tooth to correct alignment, color, or appearance; to smooth over cracks or other visible signs of damage from decay; or to fill in gaps between teeth. In the bonding process, the tooth is first roughened so it will receive the resin material. A special gel is placed on the surface of the tooth, followed by a priming agent. The resin material is then applied to the surface of the tooth. Once it hardens it is molded and polished for and a clean finish.