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Veneers are often thin shells (0.5 to 0.7 mm thickness) attached to the front part of teeth to improve the appearance. They are made of either porcelain or composite resin. Porcelain veneers are preferred by most people as they are stronger than composite resin veneers and do not change colour or stain easily. However, once they are chipped, veneers may require a total replacement, whereas composite veneer can be repaired.