Porcelain veneers are thin ceramic shells adhered onto the surfaces of prepared teeth in much the same way that false fingernails are applied. Veneers correct or camouflage severe discoloration, damage, misalignment, or teeth that are poorly shaped. Usually two visits are required. In the first visit, a thin layer of enamel is removed and an impression is taken, and a veneer is fabricated to fit the tooth. In the second visit the tooth is etched with and acidic solution and painted with an adhesive resin, the veneer is applied, and the resin is hardened with a bonding light.
Veneers are much more durable and last considerably longer than bonding.
Veneers are often used on more severe problems, and although they're generally more expensive, they're also more durable and resistant to chipping and staining. Your dentist will discuss with you which procedure is most appropriate. They aren't as strong as your natural enamel and may more easily chip or fracture. Discoloration's caused by some filling materials and dark internal stains, such as those caused by injuries or antibiotics like tetracycline, are very difficult to bleach. In those cases your dentist may recommend veneers.