Cosmetics are related to dentistry, but they differ from the general dentistry we know. To some extent, cosmetic dentistry can involve aesthetics in shaping your smile to match the color of your teeth. People undergo cosmetic surgery for various reasons, each of which depends on their individual needs. Some people like the good old smile or the smile of a movie star with white teeth. Others prefer to straighten a crooked smile (caused by crooked teeth or a group of teeth).