Professional at home teeth whitening
Professional home whitening uses dentist-planned trays and peroxide gel, with fit and concentration chosen after checking your teeth and gums.
The short answer
Professional home whitening uses custom trays made from impressions or scans, filled with a dentist-selected peroxide gel and worn for prescribed periods. The clinician checks for cavities, cracks, gum inflammation, exposed root surfaces, and existing restorations before prescribing it.
How do peroxide agents alter tooth stains?
The active agents are usually carbamide peroxide or hydrogen peroxide, which diffuse through enamel and dentin and alter stain molecules. A tray that seals against the gum margin helps keep gel on the teeth and away from soft tissue.
What should happen before your whitening trays are made?
Have the dentist record your starting shade, examine the tooth surfaces, and make or verify the trays. Use only the prescribed amount, keep gel off the gums, and pause if burning gum pain or marked sensitivity develops.
When should you arrange an examination before whitening?
Arrange an examination before whitening if you have toothache, bleeding or swollen gums, visible holes, or a single dark tooth. Seek prompt care for persistent pain, facial swelling, or a tooth that changed colour after trauma.
Could the colour change come from decay or restorations?
Ask whether the colour change is surface stain, internal discolouration, decay, or a non-vital tooth, and whether fillings, crowns, or veneers will change colour. Ask which gel, tray wear schedule, sensitivity plan, and review appointment fit your mouth.
Frequently asked questions
Can professional home whitening treat one dark tooth?
A single dark tooth may need an examination for trauma, decay, or loss of pulp vitality before whitening is chosen.
Why do my gums sting during whitening?
Gel may be contacting the gum or the tooth may be sensitive; stop the session and ask the prescribing dentist to check the fit and plan.
Keep reading
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.