Most people will suffer a cavity or two during their lives. Dental cavities are usually caused by tooth decay as a result of eating foods that are too sugary and not practicing proper oral hygiene. If you experience pain chewing or have a toothache there are good odds that you have a cavity, and the best way to treat it is to have a cosmetic filling installed. Cosmetic fillings take care of the hole or cavity that is formed by tooth decay. The area is cleaned up, sterilized and then the filling is placed and covered to restore normal function of the tooth. While it is normal to go through life with a cosmetic filling or two, there are people who need multiple fillings because of the extent of their dental decay.