What is the benefit of porcelain veneers?

Esthetics. Primarily esthetics, however depending on your situation, function and hygiene may also be included.
Versatility. The first benefit is that they are extremely versatile. Porcelain veneers are able to solve a number of different dental problems.
There are several. Porcelain veneers bond very well to tooth enamel. As a result they are strong and resist leakage and decay. Moreover, since they are made of a ceramic, they are color stable and the surface is strong and resists wearing away. In addition they are artistically created outside your mouth so the aesthetics can be enhanced and more so controlled.
Cosmetic. People usually get porcelain veneers because they want their smile to look much better. Veneers are placed over the front of the tooth which usually has been slightly reshaped to the veneer will bond to the tooth. I love doing them because they make some wonderful major changes to a persons smile.
Esthetics. Considerably less invasive that crowns. They are a thin veneer, bonded to the tooth, that improve shape, color, and sometimes size. A non-surgical alternative might be Orthodontic Treatment to improve occlusion followed by whitening or less complex veneers. Ask your Dentist for advice.