Composite veneers are quicker as they can be done chairside in a single visit. Your dentist will match the resin to the shade of your surrounding teeth to resemble your natural teeth. The resin is added to your teeth, cured and then polished.
Porcelain veneers take up to two visits as the dentist will remove a thin layer of your teeth. He will then take an impression of your teeth and will send the mould out to the lab to be fabricated. During this time, you will need to wear temporary veneers until your porcelain veneers are ready to be bonded to your teeth in the next visit.