Most procedures take as little as 10 to 15 minutes per tooth, depending on how complicated your particular treatment may be. At your actual bonding appointment, the dentist will use a mild etch to condition the surface of the tooth so the composite will adhere to it. Next, the dentist applies several layers of the bonding material onto the tooth, then uses a light source to set the material. The last step is shaping, smoothing, and polishing the surfaces. As with your natural teeth, cosmetically bonded teeth may chip or stain.