While traditional dentistry focuses on oral hygiene and preventing, diagnosing, and treating oral disease, cosmetic dentistry focuses on improving the appearance of a person's teeth, mouth, and smile. Cosmetic dentistry may also provide restorative benefits. For example, dental fillings are a common procedure used to treat decayed teeth. Today, dental fillings may fall into the category of cosmetic dentistry, because you can select fillings made of porcelain or composite materials that closely match the color of your teeth, thus maintaining the natural appearance of your teeth and smile.