Teeth lightening
Teeth lightening usually means whitening stains with peroxide-based treatment, but the suitable method depends on the cause of discoloration, tooth...
The short answer
Teeth lightening usually means whitening stains with peroxide-based treatment, but the suitable method depends on the cause of discoloration, tooth health, restorations, and sensitivity.
How does peroxide change the colour of natural teeth?
Whitening changes the colour of natural enamel and dentine by allowing peroxide molecules to break down some staining compounds. It does not lighten fillings, crowns, veneers, or tartar, and brown, grey, or one dark tooth may need a different diagnosis. A dentist first checks for cavities, cracks, gum disease, exposed dentine, and existing restorations. Treatment may include professional application or a custom tray with an appropriate gel, followed by instructions on contact time and sensitivity management.
When should you see a dentist before lightening your teeth?
Seek dental care before whitening if you have pain, untreated decay, gum bleeding, a fractured tooth, or a single tooth that has darkened. Stop treatment if sensitivity or gum irritation is significant or persistent.
What should you ask about the cause of tooth discolouration?
Ask what caused the discoloration and whether all visible teeth are natural. Ask which peroxide system is proposed, how to protect the gums, and how existing restorations will look afterward.
Frequently asked questions
Can whitening remove every stain?
No. Some internal discoloration, developmental changes, and restoration colours need other treatment or cannot be changed by whitening.
Why are my teeth still dark after cleaning?
Cleaning removes deposits and surface stain, while tooth colour inside enamel and dentine may require whitening or another diagnosis.
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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.