As one does not brush one's teeth properly, plaque forms on the teeth and they change color. Frequent consumption of tea/coffee and artificially colored dishes changes the color of the teeth. Smoking and chewing pan masala and other tobacco products change the look of the teeth. However, these stains can be removed by ordinary scaling and polishing of the teeth. In some cases, due to fluorine contamination of water, intrinsic stains formed in the deeper layers of the teeth. Still, by the method of bleaching-bonding-cleaning, the deeply stained teeth can be made look good.