Whitening is one of the most requested services in our clinic, and one of the most misunderstood. Here is the honest version.
What whitening does to enamel
Peroxide gel penetrates the enamel and breaks down the pigment molecules inside it. It does not strip or thin enamel. Decades of research on professional whitening at controlled concentrations show no lasting damage to tooth structure when it is applied with gum protection and followed by fluoride.
Why teeth get sensitive
Peroxide temporarily opens the microscopic tubes in dentin, so cold and air reach the nerve more easily for 24 to 48 hours. This is normal and reversible. Desensitizing gel, fluoride and a slower protocol keep it manageable. Sensitivity that lasts longer usually means the gel reached exposed root surface, which is why assessment comes first.
Where the risk actually is
- Whitening over untreated cavities or cracks, where gel reaches the nerve
- Whitening on inflamed gums, which stings and gives patchy results
- Overusing strips at home, which can cause chronic sensitivity and uneven colour
- Unregulated kiosks or online kits with unknown concentrations
Who should not whiten
Pregnant or breastfeeding patients, children under 16, and anyone with untreated decay or gum disease. Crowns, veneers and fillings do not change colour, so if you have a restoration on a front tooth we show you how it would look first.
Why we clean first
Gel cannot get through plaque and tartar. Whitening over buildup gives blotchy results. A cleaning and polish also removes surface stain, so you start from your true shade and often need less whitening than you expected.
Read about our in-clinic and take-home options on the teeth whitening page.