Most teeth can be bleached for a whiter, brighter, smile. If a patient has crowns or veneers, these will not bleach. A patient can get crowns or veneers whiter then their natural teeth and then bleach the others to match. A "yellow" tooth bleaches much easier then a "gray" or "brown" tinted tooth. Sometimes it is suggested to have your teeth cleaned and polished before bleaching since any plaque or build up on the teeth won't bleach or the tooth underneath.
Dr. James L. Johnson