Treatment that lightens the natural colour of teeth, done in the chair or with custom trays at home.
What it involves
Whitening uses a peroxide-based gel to lighten stains within the tooth. It does not change the colour of fillings, crowns or veneers. In-chair treatment uses a stronger product under the dentist's control; home kits use custom trays and lower strengths.
Who it suits
Suits healthy teeth and gums. Decay, gum problems or worn enamel should be treated first. Some people have sensitive teeth and should discuss it beforehand. Whitening is not recommended during pregnancy, and its safe use in young people is limited by regulation.
How it usually works
A check for decay and gum health, a record of the starting shade, protection for the gums, then the gel is applied for set periods. A home kit means wearing trays for a set number of days. Results vary between people and between types of stain.
Risks and things to consider
Temporary sensitivity and gum irritation are common. Results are not permanent, and drinks, tobacco and food will gradually darken teeth again. Uneven results can happen around restorations that will not whiten.
Questions to ask before you decide
How strong is the product and is it regulated for use in my country? What will my existing crowns and fillings look like afterwards? How long could the result last and what does a top-up involve?
General information, not medical advice. A dentist decides what suits you after examining you.