A veneer is a thin covering, custom-made shell used to fit over any part of the teeth that is crooked or slightly off-shape, or has a natural yellow or dark stain. Veneers mask the look of the crooked defects, discoloration, and irregular length in your teeth. Porcelain is used for veneers because it is translucent and mimics the reflective properties of your own teeth, creating a natural look. Porcelain is perfect for this type of procedure because it resists most stains and will last for many years.