Colgate Whitening Strips: What Changes
Colgate whitening strips can lighten some surface and internal stains, but results vary with enamel, stain type, fit and how they are used.
The short answer
Whitening strips can lighten some surface and internal stains, but results vary with enamel, stain type, fit, and treatment use. They cannot whiten fillings, crowns, veneers, or the natural color of dentin beneath enamel.
What does a before-and-after strip result show?
A before-and-after comparison usually describes a change in tooth shade after a strip course. The strip contains a peroxide gel that contacts enamel and breaks down some stain molecules, while uneven contact can leave patchy areas.
How should you apply whitening strips safely?
Follow the product directions, keep the strip on the teeth rather than the gums, and stop if marked sensitivity or gum irritation develops. A dental cleaning can remove plaque and calculus first, and a dentist can check whether the color is stain, decay, fluorosis, or restoration material.
When should teeth be checked before whitening strips?
Arrange an examination before whitening if a tooth is painful, has a cavity, or has a crack, or if one tooth is much darker than the others. Seek prompt care for swelling, spontaneous pain, or sensitivity that persists after stopping the strips.
What should you ask about strips and restorations?
Ask whether the discoloration is on the enamel or within the tooth, whether existing restorations will match afterward, and which peroxide strength and wear schedule fit your teeth. Ask how sensitivity will be managed and whether professional whitening or another treatment is more appropriate.
Frequently asked questions
Will strips whiten a crown?
No. A crown keeps its existing shade, so it may need matching treatment if nearby teeth change.
Why are my teeth sensitive afterward?
Peroxide can temporarily irritate dentin pathways and the pulp, especially when enamel is thin or exposed.
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.