A veneer is a thin layer of porcelain that is placed over the front side of a tooth. They are generally used to improve aesthetics. Having veneers placed usually involves two appointments because the veneers are fabricated in the dental laboratory. At the first appointment, the teeth are prepared and shaped, impressions are taken, and the teeth are given a temporary covering. After two or three weeks, the temporary coverings are removed, and the veneers are bonded to the teeth. The laboratory-fabricated veneers are usually made using porcelain or pressed ceramic and are aesthetically pleasing.