Effective Teeth Whitening - What Really Works Best? Teeth whitening or teeth bleaching is basically the procedure of whitening the shade of the white color of human teeth from the original color that was set. Whitening is most often desired when teeth turn yellow over time due to several reasons, and is done by either changing the extrinsic or intrinsic color of your tooth's enamel. There are many teeth whitening products available in the market today. The question is: Which among them deliver results? Here is some information on different teeth whitening products and how effective they may be when used correctly. http://jef.oops.jp/