How many shades whiter can I expect my teeth to get?
The amount of whitening varies from person-to-person and cannot be predicted or guaranteed; but in general use, teeth may lighten anywhere from 6 to 12 shades on the whitening shade guide. The results depend greatly on how discolored the teeth were originally. Yellow or brown teeth, surface stains, and uniformly darkened teeth are easiest to whiten. Additional whitening treatments may be needed in order to achieve the desired shade, especially with heavily stained teeth.