• A veneer is a thin layer of porcelain or composite placed over the front of a tooth, either to improve the aesthetics of a tooth, or to protect a damaged tooth surface. A composite veneer is done by the dentist in one visit.  This procedure costs less, but may not be as permanent as a porcelain veneer.  Composite can stain over time requiring another veneer be placed.  In contrast, a porcelain veneer is prepared chairside and then an impression is made and sent to a laboratory. Porcelain is more durable and resistant to stain and color change.