If you choose the right cosmetic dentist, the veneers process will be comfortable and enjoyable. We now have technology that allows us to be extremely conservative in our preparations, and, in some cases, requiring no preparation of your teeth. Not to mention -- the results will have you smiling a gorgeous smile for years and years to come!
It depends on patients. Some patients who have sensitive teeth and a large pulp or had a tooth that was not aligned with the rest of the dentition and needed more tooth structure removal can get sensitive and might need some anesthetic before veneer placement. If patient need anesthetic I usually use a very light one just to make them comfortable. But most patients don't need any anesthetic for seat day.