Porcelain veneers are quite sturdy, and breakages, defects and chips are rare. When damage occurs, it is often because the tooth was not set correctly or the veneer was not properly bonded. Also, malocclusions can chip or dislodge veneers, which is why a cosmetic dentist should correct teeth misalignments before placing veneers.

Your dentist can only make repairs with dental bonding or composite materials, not porcelain. It may be possible to create a satisfactory result with plastic, but over time, the less durable material (composite) will deteriorate as evident by chipping and discoloration and will stand out from the veneer.

If the repair is done on points that experience significant pressure or force, such as the biting edges, creating a bond between the porcelain veneer and the composite patch will probably be hard or impossible.