As an individual grows older there are certain changes which take place in the body and one of these changes is the discoloration of teeth. Since it is human nature to find a solution for every problem, the occurrence of teeth discoloration led to the discovery of various techniques of teeth whitening.
Since this process was concerned with the treatment of the dental set-up these techniques were classified under the branch of cosmetic dentistry and could be performed at a certified dental practice.

There are many reasons, due to which an individual may face discoloration of teeth like staining, thickness of the enamel and the whiteness of the base. Tooth discoloration which occurs due to staining may be caused by extrinsic or intrinsic factors both of which cause a distinct change in color of the teeth. In the field of cosmetic dentistry, it is widely assumed that while the extrinsic staining is caused due to the consumption of certain foodstuffs like coffee, wine, tobacco and tea the intrinsic staining is caused by factors such as ageing, trauma, medications or excessive use of fluoride. The science of cosmetic dentistry goes on to extrapolate that staining may also be caused if the thickness of enamel gradually wears out with the passage of time or if the base color of the teeth is not as white as it should be due to inherent factors. [More]