Results will vary from person to person depending on stain level, genetics, and dietary habits. As a general rule, a person with average stained teeth and no natural sensitivity will see results in 7-14 applications. For those with sensitivity (who require shorter whitening sessions), it may take more than 14 applications. Just remember, each time you whiten, you are removing years of staining. Be patient! Once you have removed all your stains, it is incredibly easy to maintain those results for life!