Bonding...
Composite materials made of binder resin and fine glass filler can be applied to the enamel using an etched process. It can be used to repair chips, fill gaps, or change shape and color of teeth. It is one of the most conservative cosmetic procedures and can be placed in one visit. The dentist is able to mix the composite material and match it to the patient's tooth color for a natural appearance.
Before and after pictures of bonding procedures(click for larger image)