Tooth Whitening like hair and skin, teeth vary in colour.  Some are yellower or darker than others, even though they are quite healthy.  Teeth tend to become darker as people get older.  Tooth colour can be gradually and effectively lightened and restored to a natural whiter colour.  Bleaching improved the appearance of your teeth without removing any of the natural tooth surface.  It is a better option than a crown or veneer if you want to lighten the colour of helthy teeth, as the placing of crowns and veneers involves changing the shape of the tooth.