Big white smile teeth whitening
Peroxide whitening lightens natural enamel and dentine, but it does not change the color of fillings, crowns, or veneers.
The short answer
Teeth whitening lightens natural tooth structure by allowing a peroxide gel to break down colored molecules in enamel and dentine; it does not whiten fillings, crowns, veneers, or other restorations.
What can an examination reveal before whitening?
A dental examination checks for decay, cracks, leaking restorations, gum recession, and existing sensitivity before whitening. The final shade depends on the starting color, stain type, enamel and dentine, and the method used.
What should happen before peroxide whitening begins?
Have a dentist identify the stain and protect the gums before applying or prescribing a peroxide system. Reduce strong staining exposures during treatment and follow the specified wear time rather than leaving trays in longer.
When does tooth colour need dental assessment first?
Seek dental care before whitening if a tooth hurts, gums bleed, surfaces are eroded, or one tooth is much darker than the others. Stop and contact the provider if pain or soft-tissue irritation is significant.
What should you ask about shade change and sensitivity?
Ask whether the discoloration is intrinsic or surface stain, which teeth and restorations will change, how sensitivity will be managed, and whether trays or in-office application are appropriate.
Frequently asked questions
Why is a dental examination needed before whitening?
A dental examination checks for decay, cracks, leaking restorations, gum recession, and existing sensitivity before whitening. The final shade depends on the starting color, stain type, enamel and dentine, and the method used.
What can I do now?
Have a dentist identify the stain and protect the gums before applying or prescribing a peroxide system. Reduce strong staining exposures during treatment and follow the specified wear time rather than leaving trays in longer.
When is care urgent?
Seek dental care before whitening if a tooth hurts, gums bleed, surfaces are eroded, or one tooth is much darker than the others. Stop and contact the provider if pain or soft-tissue irritation is significant.
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.