Teeth whitening is an effective way of lightening the color of the teeth, and removing stains on the enamel. The stains can be divided in to two categories. They are extrinsic staining and intrinsic staining. Teeth whitening is basically the bleaching process used to avoid the discoloration of the teeth. Teeth whitening treatment provides you with the results that are effective and noticeable. Teeth whitening can lighten the existing shade of the teeth. Teeth whitenig can be done using three options : In-Office, Take-home whitening kits and over the counter whitening kits.