Teeth whitening is a cosmetic dental procedure designed to lighten the color of teeth and remove stains and discoloration. The procedure can be performed either in a dental office by a professional or at home using over-the-counter products. During an in-office whitening session, a dental professional typically begins by cleaning the teeth to remove any surface plaque and debris. A protective barrier is then applied to the gums to shield them from the whitening agent, which is usually a hydrogen peroxide or carbamide peroxide-based gel. The gel is carefully applied to the teeth and may be activated by a special light or laser to enhance the whitening effect. The gel is left on the teeth for a specified amount of time, usually between 15 to 30 minutes, before being rinsed off. This process may be repeated several times during a single session to achieve the desired level of whiteness.

For at-home teeth whitening, patients are usually provided with custom-fitted trays and a milder whitening gel by their dentist. The patient fills the trays with the gel and wears them over their teeth for a specified period, typically for a few hours each day or overnight, depending on the strength of the gel and the dentist's recommendations. Over-the-counter whitening kits, which include whitening strips, gels, or toothpaste, are also available and offer a more convenient but generally less effective option. These products usually contain lower concentrations of the active whitening ingredients and may take longer to show visible results. Regardless of the method chosen, it is important for individuals to follow the instructions carefully to minimize the risk of side effects, such as tooth sensitivity and gum irritation, and to ensure the best possible outcome. Regular dental check-ups are recommended to monitor the condition of the teeth and gums and maintain overall oral health while using whitening products.