Crest professional effects
Professional whitening products use peroxide to lighten natural tooth stains, with effects and irritation depending on concentration, contact time, and teeth.
The short answer
Professional whitening products that use peroxide can lighten stains on natural teeth, while the main clinical effects to discuss are colour change, temporary sensitivity, and possible gum irritation. They do not lighten fillings, crowns, or veneers.
How does peroxide change the colour of teeth?
Peroxide penetrates enamel and dentine and reacts with coloured molecules. The result depends on whether the stain is on the surface or within the tooth, and intrinsic discolouration may need a different plan from coffee or tea staining.
How can you use professional whitening safely?
A dentist checks for decay, cracks, gum recession, and mismatched restorations before recommending a product or regimen. Follow the label or prescription exactly, use a well-fitting tray when supplied, and stop if the gums become sore.
When do whitening effects need dental review?
Arrange an examination for severe or persistent sensitivity, white or burned-looking gum patches, uneven whitening, or a tooth that remains dark. A single dark tooth may need a pulp assessment rather than more whitening.
What should you ask about whitening effects?
Ask which stain is present, whether the product suits your enamel and gums, and which restorations will remain unchanged. Ask how to manage sensitivity and when to reassess the shade.
Frequently asked questions
Can whitening damage a filling?
Whitening does not bleach the filling, so the restoration may look different from the surrounding tooth afterward.
Why do my gums sting during whitening?
Gel may contact the gum, or the tissue may be sensitive; a clinician can check the fit and the product 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.