Teeth whitening is a cosmetic dental procedure that is designed to improve the appearance of discoloured or stained teeth. While there are several different methods of teeth whitening available, professional teeth whitening at the dentist is one of the most effective and long-lasting options.

Here is how teeth whitening at the dentist typically works:

1. Evaluation: Before beginning the teeth whitening process, the dentist will evaluate the patient's oral health and the extent of the discoloration or staining. They may also take photographs or impressions of the teeth to monitor progress throughout the treatment.

2. Preparation: The dentist will prepare the teeth for whitening by cleaning them thoroughly to remove any surface debris or plaque. They may also place a protective barrier or gel on the gums to prevent irritation or sensitivity.

3. Application: The dentist will then apply a high-strength bleaching agent to the teeth. This typically involves using a custom-made tray or applying the bleaching agent directly to the teeth. The bleaching agent is typically a hydrogen peroxide or carbamide peroxide solution, which works by breaking down the chemical bonds that cause staining on the teeth.

4. Light activation: In some cases, the dentist may use a special light or heat source to activate the bleaching agent and enhance the whitening effect. This process is typically done in cycles, with the bleaching agent being reapplied and reactivated several times over the course of the treatment.

5. Evaluation and maintenance: Once the teeth have reached the desired shade of whiteness, the dentist will evaluate the results and provide instructions for maintaining the whiteness of the teeth. This may include avoiding certain foods and beverages that can cause staining, using special toothpaste or mouthwash, or scheduling follow-up appointments for touch-up treatments.

Overall, teeth whitening at the dentist is a safe and effective way to improve the appearance of discoloured or stained teeth. While the results can vary depending on the individual and the extent of the discoloration, most patients see a noticeable improvement in the whiteness and brightness of their teeth after treatment.