Most dental restorative methods require more than one visit to the dentist. This means that on the first visit, you get an injection of anesthesia, your tooth prepared, an impression taken, and a temporary restoration put on your tooth. You make a second appointment for a couple of weeks later, get another injection, have the temporary pried off (if it hasn't fallen off already), and have a permanent restoration put on. Why go to the dentist a second time when you don't have to? With CEREC®, the procedure is done in a single appointment, start to finish.