It varies. A teeth whitening treatment will not make your teeth snow white; it will make them whiter. How much whiter? It really depends on a number of factors, including how stained your teeth were before the whitening, what kind of staining agents caused most of the coloration, how well your enamel reacts to gel, the kind and strength of gel used and the number of treatments performed. However, your teeth can only be whitened to their natural color, which varies significantly from person to person. Most people get impressive results while a few get less dramatic results, but 99% of people are very satisfied with the results they obtain with our system. 7-12 shades improvement is the norm with our system.