The results of any teeth whitening system can be affected by the Practitioners adherence to the protocol as prescribed by the manufacturer.
It is not a case of ‘one size fits all’.
The best procedure for your teeth can vary according to just how stained your teeth are; the type of staining; enamel density; enamel porosity; teeth and gum condition.
For best and safest results rather than just grabbing the cheapest deal, find registered teeth whitening practitioner.
Your results depend on how skilled a teeth whitening practitioner is, AND how he or she uses their teeth whitening system.