Professional cleaning of your teeth should be done before your treatment, as this will improve your results. It will also get rid of any surface stains or plaque that have built up on your teeth.Zoom teeth whitening is quick and takes little over an hour. It takes only a few minutes to prepare and an hour to perform the procedure. Your Zoom appointment will most likely require you to fill out paperwork. In addition, you will undergo a standard dental assessment, when we will make a note of any crowns or fillings. We will also check to see if your teeth and gums are healthy enough to withstand the whitening treatment.