First of all, not all teeth respond to whitening, so it's best you let us check first before you spend your money! We offer two types of bleaching. The first is Zoom where the bleaching takes place at the Surgery over a 60-90min period at the end of which your teeth will be whitened. The second is where take home bleaching trays are made in which you put in a small amount of bleach every day whilst you watch TV or read for an hour or so.You then have the trays to keep and maintain the effect as necssary.