Bonding is a popular treatment option because it provides a successful attachment between the filling material and the tooth’s original enamel and dentin. It looks like the original tooth and functions like it as well.
Direct composite bonding is used to recreate a smile in an additive manner, where little or no tooth reduction is needed. Direct bonding, in the hands of a skilled operator, is less costly than porcelain veneers and crowns and can be long-lasting with proper maintenance.
Tooth bonding is used to repair chipped teeth,  to repair damage from tooth decay, to improve tooth alignment, to fill gaps between teeth.
Bonding materials (high-density, modern plastics called composite resin) and porcelain—are more natural in color and can be designed to perfectly match the surrounding teeth making it difficult to discern there ever was a broken tooth.