Bonding is the use of tooth colored-resin composite materials or porcelains to repair teeth, to replace broken or missing parts of teeth, to cover stains and discolorations on teeth, or to reshape and change the color of teeth by a process of bonding or sticking the filling to the teeth.

Bonding can be done with direct or indirect fillings depending on the size of restorations.

Direct Filling: directly apply the fillings materials (e.g. resin composite) to the tooth.

Broken front tooth
Front tooth with decay
After bonding restoration
Posterior Tooth with decay
After direct composite bonding procedure

Indirect Bonding can be an Inlay or an Onlay:

Inlay: An intracoronal dental restoration, made outside the oral cavity to conform to the prepared cavity, which restores some of the occlusal surface of a tooth, but does not restore any cusp tips. It is retained by resin cement.

Onlay: A dental restoration made outside the oral cavity that covers one or more cusp tips and adjoining occlusal surfaces, but not the entire external surface. It is usually retained by resin cement.