My teeth were very stained from many years of coffee drinking so I wasn't expecting too much given that this was the cheapest company I could find that would visit me at the office. I really liked that they could come to me which saved me traveling across London. My teeth now look great. Friends warned me about possible sensitive teeth but I've had no sensitiveness at all. The dental technician was really friendly and the hour long process flew by. There was no discomfort beyond smiling for nearly an hour!