Here is another example of tetracycline staining.  The technique used for this patient is called porcelain laminates.  In this technique, a small amount (.5mm) of tooth structure is removed from the front of the teeth and then an impression is taken and sent to a laboratory.  In the lab, space-age porcelain materials are formed into a very thin piece called a laminate veneer.  This porcelain can be formed and colored to appear incredibly tooth-like.  The laminates are then tried on the tooth and are glued into place with special bonding materials.  An opaquing substance is mixed with the bonding material to mask the dark gray shade of the underlying tooth.