Results will vary from person to person depending on the severity of staining, genetics, and dietary habits. As a rule of thumb, a person with average stained teeth and no natural sensitivity will see results in 60-90 minutes of an in-clinic treatment or 7-14 applications of a home whitening treatment.
For those with sensitivity (who require shorter whitening sessions or a weaker gel), it may take more than 14 applications. Please remember, every time you whiten, you are removing years of staining. Once you have removed all your stains, it is incredibly easy to maintain those results for life!