Bonding is the application of tooth-colored composite resin that helps repair decayed, chipped, or discolored teeth. It can be used to fill in spaces between teeth or change the shape of your teeth. Bonding may also be used for changing the appearance of your smile. Although not quite as durable as veneers, bonding can be an effective alternative and can still last several years. Bonding treatments can generally be done in one office visit.