Veneers are thin, custom-made shells that are applied to the front surface of your teeth to improve their appearance . They are a popular cosmetic dentistry treatment that can be used to address a variety of concerns. Veneers are made from either porcelain or composite resin.expand_more Porcelain veneers are more durable and stain-resistant than composite veneers, but they are also more expensive.expand_more Composite veneers can be placed in a single appointment, while porcelain veneers usually require two appointments.