If you prefer teeth that are immediately whiter right now or you would rather whiten your teeth over a few nights while you sleep, Drs. Wong or Cheng has your answer In-Office Whitening System. The system uses proprietary technology to whiten your teeth an average of eight shades* in a little over an hour while you relax at your dentist’s office. It’s ideal for anyone who wants immediate results and you may go even lighter with additional take home applications. Start on Friday and by Monday you’ll have a whole new smile. Strips or paint-on gels are a waste of time.