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Dentists also use Carbamide Peroxide in custom made trays as it provides for a slow release over long periods (usually overnight).
In-clinic systems such as Zoom use Hydrogen Peroxide. 6% Hydrogen Peroxide is equivalent to 18% Carbamide Peroxide.
Unfortunately, the current guidelines are not stopping ‘non-dentists’ from providing tooth whitening. The European Commission announced on the 20th of September 2011 that it welcomes the new Directive on tooth whitening products.