Once a tooth has decay, the cavity resulting from plaque bacteria needs to be replaced with a filling or bonding. A bonding is a non-metal composite resin that is used instead of amalgams (metal fillings). Metal fillings tend to expand and contract with exposure to heat and cold, causing them to crack and wear down the natural tooth. With bondings, the top surface of the tooth is roughened and a tooth
colored resin is applied and bonded to the shape of the tooth. A special UV light is used to solidify the material, which is then polished and shaped to match the natural tooth. Bondings are also an effective cosmetic option for patients who want a more natural look as opposed to the older style metal fillings.