My goal during your whitening session is to lighten the dentin layer, which is the layer of the tooth just below the enamel. Everyone's dentin layer has a different shade and everyone's teeth respond differently. Ultimately your teeth will tell me how bright they want to go and have their own natural stopping point. On average you will leave your whitening session 3-8 shades brighter. Regular whitening sessions every 6-12 months will help you achieve maximum brightness.