This is one of the most popular cosmetic dentistry procedures performed worldwide. This simple treatment can make you look younger as your teeth become whiter than ever. Dark colored foods and beverages can stain teeth over time, making them look dull and dingy. Smoking can also stain your teeth. Dingy, stained teeth cause you to look older. Professional whitening can make your teeth several shades whiter. When you see the before and after results of your whitening process, you are sure to be amazed at the difference.