Erase discolouration from soft drinks, coffee, tea, tobacco and other staining agents with customized take-home teeth-whitening trays from Vancouver Dental Spa. Consultants will take an impression of your teeth during an office visit to create personalized trays that are then filled with a whitening gel and worn 30 minutes a day for seven to 10 days. If your teeth are sensitive, the clinic recommends a desensitizing treatment before whitening.