The procedure takes about an hour; first the dentist will apply a protective gel to your gums. Next the bleaching agent is applied to the teeth, and a special light is be used to enhance the action of the agent.

After the procedure your dentist will recommend that you avoid some types of food and beverages that may stain or discolor your teeth - such as coffee, tea or red wine - for a few days.

You should also know that it cannot make a complete colour change; but it will lighten the existing shade. The effects of whitening can last up to three years; however, this will vary from person to person. The effect is less likely to last as long if you smoke, or eat or drink products that can stain your teeth.