Bonding is the application of a tooth-colored composite resin (plastic) to repair a decayed, chipped, fractured or discolored tooth. Unlike veneers, which are manufactured in a laboratory and require a customized mold to achieve a proper fit, bonding can be done in a single visit. The procedure is called bonding because the material bonds to the tooth.

Bonding is among the easiest and least expensive of cosmetic dental procedures. The composite resin used in bonding can be shaped and polished to match the surrounding teeth. Most often, bonding is used for cosmetic purposes to improve the appearance of a discolored or chipped tooth. It also can be used to close spaces between teeth, to make teeth look longer or to change the shape or color of teeth. Its disadvantage is that it stains and chips more easily than porcelain veneers, but can be a good economic alternative.

Sometimes, bonding also is used as a cosmetic alternative to amalgam fillings, or to protect a portion of the tooth's root that has been exposed when gums recede.

Tea, coffee, cigarette smoke and other substances can stain the resin. To prevent or minimize stains, it's essential to avoid eating or drinking foods that can stain the composite. In addition, brush your teeth often and have them cleaned regularly by a dental hygienist.

The composite resin used in bonding isn't as strong as a natural tooth. Biting your fingernails or chewing on ice or pens can chip the material. Bonding usually lasts several years before it needs to be repaired. How long it actually lasts depends on how much bonding was done and your oral habits.