what do Dental Veneers do and how are they fitted?

http://www.kentsmilestudio.com/dental-services-kent/kent-dental-veneers/ Kent dentist, Dr. Dattani explains Dental Veneers: Basically tooth veneers are porcelain thin shaped veneers that sit on top of teeth essentially a bit like a false fingernail that sits on top of a lady’s nail. What they do, they change the shape, the size and the contouring and to some degree the colour of the teeth so you get a more natural, more elegant smile.