Whitening your teeth can often be achieved in as little as 2 weeks. In order to do this, an impression of your teeth is taken to fabricate custom whitening trays. These trays are used to hold the whitening gel in close contact to your teeth. You apply the supplied whitening gel to these trays, and wear them for 30 minutes a day for fourteen days. The shade of your teeth will whiten based on the length of treatment.