As you get older, your teeth naturally become darker. If you drink tea, coffee and wine or consume other foods and drinks with strong color, your teeth may become discolored earlier.Tooth whitening or bleaching has become one of the most popular esthetic dental treatments. Teeth whitening are ideal for people who have healthy, non-restored teeth (no fillings) and gums. Persons who have yellow coloration in the teeth respond best. Teeth whitening can't make your teeth white. it can however lighten the present color by various shades. The dentist will take an impression of your teeth to make a mouth-guard and will instruct you how to use it with a bleaching gel. Professional bleaching can be either internal or external.