A brighter smile is one of the most popular cosmetic requests, and whitening is among the simplest ways to get one. The key is choosing a safe method that suits your teeth.
How whitening works
Whitening gels contain hydrogen peroxide or carbamide peroxide. They penetrate the enamel and break down the stain molecules, making teeth lighter. It lightens natural tooth structure but does not change the colour of crowns, veneers or fillings.
Options compared
- In-clinic whitening. A stronger gel is applied under dentist control, with the gums protected. It gives visible results in a single visit.
- Dentist-supplied take-home trays. Custom-fitted trays and a milder gel used over a number of days. Gradual and well controlled.
- Over-the-counter strips and pastes. Convenient, though results are modest. Poorly fitting products can irritate the gums.
- Charcoal and home remedies. Little evidence of safe whitening, and abrasive products can wear enamel.
Is it right for you?
Have a check-up first. Cavities, gum disease and worn enamel should be treated before whitening. Whitening may not be suitable during pregnancy, and teeth stained by certain medicines or fluorosis may respond differently. Existing crowns and fillings will not whiten, so they may need replacing to match.
Side effects
- Sensitivity to cold during or after treatment, usually settling in a few days
- Gum irritation from gel contact
Using a desensitising toothpaste and following your dentist’s instructions reduce these. See tooth sensitivity.
Making results last
- Limit tea, coffee, red wine and cola, or rinse with water afterwards.
- Avoid tobacco in all forms.
- Brush twice a day and have regular cleanings. Read why teeth get stained.
Next steps
If you want a more dramatic or permanent change, such as reshaping or covering teeth, see veneers vs bonding. Our teeth whitening service begins with an examination and shade assessment.