Teeth can often be whitened by the several new techniques of "bleaching" available today. The most common method is the one called the "in-office" method. In this method, the teeth are first protected and isolated with a special casing. A strong bleaching agent is placed over the isolated teeth, and a special light is used to assist the bleaching material to lighten the teeth. This is a globally preferred method of dental bleaching, and better for people who have tetracycline stains or streaks on their teeth.
The "home" techniques involve making trays which fit into the mouth. These are then filled with bleaching material. When worn for a few hours a day, noticeable results are seen. The results may last from a few days to a couple weeks. Results vary from individual to individual, and it is best to check with your dentist to help decide which method will work best for you. Some of the factors involved include the intensity of the stains, whether or not you have fillings or crowns on your front teeth, as well as what may have caused the stains