Professional teeth whitening can lighten many forms of natural-tooth discolouration. It does not improve oral health by itself, and it is not suitable for every type of staining. A dental assessment helps identify decay, gum problems, cracks or restorations that may affect the plan.
How does whitening work?
Whitening gels use peroxide-based ingredients to break down colour molecules within natural tooth structure. Dentist-supervised options may include custom trays used at home, an in-clinic protocol or a combination. The appropriate method depends on the starting shade, sensitivity and clinical findings.
What whitening cannot change
Crowns, veneers, fillings and bonding do not whiten in the same way as natural enamel. If these are visible, they may need replacement after the final shade stabilises—but only when clinically and aesthetically justified. Deep intrinsic discolouration may respond differently and can require another approach.
Sensitivity and gum irritation
Temporary sensitivity is common. The dentist may adjust product strength, frequency or exposure and recommend a desensitising product. Using excessive or unregulated whitening material can irritate gums and increase sensitivity.
How long does it last?
Whitening is not permanent. Tea, coffee, tobacco and strongly coloured foods can contribute to new staining. Maintenance varies, and repeated treatment should remain professionally supervised.
Before a major event
Do not leave whitening until the day before a wedding or event. Allow time for assessment, treatment and any temporary sensitivity to settle.
Clinical content should be reviewed before final publication.
Last updated: August 2026