Coffee, tea, wine and other colored drinks and food stain your teeth over time. Whitening procedure removes those stains and brightens the enamel of the tooth. There are two types of whitening systems: in-office procedure and take home procedure. In office procedure, which takes about an hour to an hour and half, will give you a more immediate result, however, it does come with one negative feature and that is post-procedure sensitivity for about a day. Take home procedure involves you wearing custom made trays and applying whitening solution daily for 30-45 mins at a time for about 4-5 consecutive days to achieve the same result as one hour in office procedure. The sensitivity through the process is almost non-existent but it does require your commitment to wear whitening trays. Your choice!