Bonding is often performed in order to fill in gaps or change the color of your teeth. It typically only entails one office visit, and the results last for several years. Bonding is more susceptible to staining or chipping than other forms of restoration such as veneers. When teeth are chipped or slightly decayed, bonded composite resins may be the material of choice. Bonding also is used as a tooth-colored filling for small cavities and broken or chipped surfaces. In addition, bonding can be used to close spaces between teeth or cover the entire outside surface of a tooth to change its color and shape. Crowns, also known as caps, are used in cases where other procedures will not be effective. Crowns have the longest life expectancy of all cosmetic restorations, but are the most time consuming.