Bleaching is a whitening treatment
Dental bleaching is a whitening treatment that uses peroxide chemistry to lighten stains in natural tooth enamel and dentine.
The short answer
Dental bleaching is a whitening treatment that uses peroxide chemistry to lighten stains in natural tooth enamel and dentine. It changes the colour of natural teeth, not the colour of fillings, crowns, veneers, or other restorations.
How does peroxide lighten stains inside a tooth?
Peroxide molecules break down stain compounds within the tooth structure. Surface stains from foods or tobacco may respond to professional cleaning, while deeper or age-related colour changes may need a planned bleaching course.
What should a dentist check before bleaching your teeth?
A dentist first checks teeth, gums, fillings, cracks, decay, and the cause of discolouration. Treatment may use custom trays or an in-office gel, with instructions about application, contact with the gums, and managing sensitivity.
When should tooth pain or gum bleeding delay bleaching?
Have a dental examination before bleaching if teeth hurt, gums bleed, enamel is worn, or a single tooth has darkened. New pain, gum irritation, or uneven colour after treatment warrants review.
What should you ask about bleaching and existing restorations?
Ask what is causing the colour change, whether existing restorations will match afterward, which method suits your teeth, and how sensitivity or gum contact will be managed.
Frequently asked questions
Is bleaching the same as cleaning?
No. Cleaning removes deposits and surface stain, while bleaching lightens colour within natural tooth structure.
Why can bleaching cause sensitivity?
Peroxide can temporarily affect fluid movement through dentine, causing short-lived sensitivity in some people.
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.