How effective is hydrogen peroxide in teeth whitening?

Effective: All bleaching for teeth contain some form of hydrogen peroxide.

Concentration Matter: The amount of whitening depends on the nature of the color, the formulation of the bleaching agent, and the concentration and time in contact with the teeth. Surface stains respond better than intrinsic stains such as tetracycline or dental fluorosis. Carbamide peroxide is a stable source of hydrogen peroxide as it releases hp and urea and it is the breakdown of hp to oxygen & water that bleaches.

Very: It is the man ingredient in nearly all bleaching products.

So-so: Hydrogen peroxide that you buy in the store is mildly effective for whitening teeth: you need to put it in a close fitting tray that fits intimately with your teeth and you would need to replenish the solution every 20 minutes to see results. Dentists supplied whitening products are at a higher concentration, less runny and more effective.