Composite bonding refers to the repair of decayed, damaged or discolored teeth using material that resembles the color of tooth enamel. Your dentist drills out the tooth decay and applies the composite onto the tooth's surface, then ""sculpts"" it into the right shape before curing it with a high-intensity light. Bonding is one of the least expensive cosmetic dentistry procedures available to patients with tooth decay, chipped or cracked teeth and worn-down edges.