Crest professional whitening strips
Whitening strips use peroxide to lighten some surface and internal tooth stains, but results depend on the stain and the product directions.
The short answer
Whitening strips use peroxide to lighten some surface and internal tooth stains, but results depend on the stain and the product directions. They cannot change the colour of fillings, crowns, veneers, or other dental restorations.
What is a peroxide whitening strip made to do?
A whitening strip is a flexible carrier coated with a peroxide gel, commonly hydrogen peroxide or carbamide peroxide. The gel oxidizes stain molecules within enamel and dentin while the strip holds it against the tooth surface. Uneven contact can produce uneven lightening.
How should you use whitening strips correctly?
Read the package directions, apply strips only to the intended teeth, and remove them for eating and drinking. Do not extend wear time or frequency to chase a faster result. A dental examination should come first when there is decay, gum disease, exposed roots, or strong sensitivity.
When should whitening symptoms be assessed by a dentist?
Ask for a dental assessment if whitening causes sharp pain, gum irritation, or symptoms that do not settle after stopping. A dentist should also assess darkening of one tooth, a broken tooth, cavities, or a restoration that no longer matches.
What should you ask about stains and restorations?
Ask what type of stain you have, whether your teeth and gums are ready for whitening, and how existing restorations will look afterward. Ask about a custom tray or in-office option if strips do not reach the desired shade evenly.
Frequently asked questions
Can whitening strips whiten crowns?
No. The natural tooth may lighten while a crown keeps its existing shade.
Why do strips make my gums sting?
Gel may contact the gum or the tissue may be irritated by a poorly fitted strip or excessive use.
Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.