Does carbamide peroxide work

Carbamide peroxide is a urea and hydrogen peroxide compound used in whitening gels. Saliva and moisture help it break down, releasing hydrogen peroxide that oxidizes coloured molecules responsible for some tooth stains.

It works best on stains within natural teeth caused by foods, drinks, tobacco, or ageing. It does not change the colour of fillings, crowns, veneers, or other restorations, and surface deposits may need professional cleaning first.

Use the product only as directed and keep gel on the teeth rather than the gums. A dentist can check for cavities, leaking fillings, gum inflammation, exposed root surfaces, or enamel defects before whitening.

If sensitivity occurs, pause or reduce use according to professional advice and avoid applying extra gel. A fitted tray helps keep the material against the teeth and away from the gums.

Seek dental advice for persistent sensitivity, gum burning, uneven colour, or pain rather than continuing treatment. A dark single tooth may need assessment because its colour can come from the pulp or an old restoration.

A dentist should assess whitening before treatment when you have untreated decay, gum disease, cracks, or extensive restorations.

Are my stains inside the tooth or on its surface? Which teeth and restorations will change colour, and how should the gel be used?