The purpose of porcelain veneers are to enhance the health and appearance of the teeth. Porcelain veneers can look totally natural and whiten dark yellow stained teeth or tetracycline stained teeth. Teeth can be whiter and straighter looking ( frequently applied to as"Instant Braces"). The shape of teeth can be enhanced, lengthened, shortened, fuller or minor full, be more round, more square or bolder looking.