A: It is important to determine why your teeth have become stained. Do you have cavities or broken down fillings? Have your gums receeded, exposing the darker root surfaces of your teeth? Perhaps your diet or age have contributed. There are a number of products which can help brighten your smile. Start with a dental check up and cleaning appointment, to ensure your teeth and gums are in top shape. Your dentist can then advise which product is indicated for your unique situation. Custom-made trays which hold bleaching gel next to your teeth is a popular way for you to whiten your teeth at home. When prescribed and supervised by your dentist, this whitening technique can be very safe and effective.