Bleaching

Bleaching is a method of tooth whitening that uses oxidising agents, typically hydrogen peroxide or carbamide peroxide, to break down coloured molecules within the enamel and dentine. It can be applied as an in‑office procedure with stronger gels and light activation or as a lower-concentration, custom-tray system for at-home use under professional supervision.

Effectiveness depends on the type and severity of staining, and results vary between individuals; intrinsic stains inside the tooth can be more resistant than surface extrinsic stains. Temporary tooth or gum sensitivity is common after bleaching, and not everyone is a suitable candidate—people with extensive restorations, certain dental conditions, children and pregnant patients should seek dental advice about safety and alternative cosmetic options.