Veneers are thin shells of porcelain covering your tooth to correct stained, chipped, decayed or crooked teeth. The procedure usually entails 3 appointments. You come in for the exam, and then return to have your teeth prepared. A thin layer of enamel is trimmed off from the front of your teeth, to provide space for the veneer to be bonded to. You receive a temporary veneer depending on how much tooth structure is removed and then it is sent off to a lab for fabrication. During the last visit the veneer is checked for fit, and once you and the dentist are satisfied with the look, it is bonded.