Crest 3d professional express
This whitening system uses peroxide in strips to lighten natural tooth colour, with results and irritation depending on the individual.
The short answer
This whitening system uses peroxide in strips to lighten natural tooth colour, with results and irritation depending on the individual. It does not change the colour of fillings, crowns, veneers, or other restorations.
How are whitening strips designed to contact teeth?
Whitening strips are flexible plastic carriers coated with a peroxide gel. The peroxide penetrates enamel and dentine and oxidizes some colour molecules, while exposure of the gum may cause temporary irritation.
How should you apply the strips and protect your gums?
Read the product directions, keep the strip on the intended tooth surface, and avoid placing gel on the gum. Stop and arrange advice if marked sensitivity, gum burning, or an uneven result develops.
Which problems should be treated before you whiten?
Have a dental examination before whitening if you have untreated decay, leaking restorations, gum inflammation, cracks, or unexplained sensitivity. A dentist can identify whether discoloration is on the surface or within the tooth.
What should you ask about suitability and peroxide use?
Ask whether your teeth and gums are suitable, whether existing restorations will mismatch after whitening, and which peroxide concentration and application time fit your condition.
Frequently asked questions
Will strips whiten a crown?
No. The natural tooth may lighten while a crown keeps its original shade, creating a mismatch.
Why do my teeth feel sensitive after whitening?
Peroxide can temporarily affect fluid movement through dentine, stimulating the tooth nerve; sensitivity that persists needs assessment.
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.