Veneer is a thin layer of restorative material placed over a tooth surface, either to improve the aesthetics of a tooth, or to protect a damaged tooth surface. There are two main types of material used to fabricate a veneer: composite and dental porcelain. A composite veneer may be directly placed (built-up in the mouth the same day), or indirectly fabricated by a dental technician in a dental laboratory and later bonded to the tooth. In contrast, a porcelain veneer may only be indirectly fabricated in a dental laboratory. In any case a veneer is a fixed, minimally invasive (0.5 mm tooth reduction), none removable restoration.