Dental filling treats a cavity in tooth. To repair a cavity, a dentist and periodontists removes the decayed tooth tissue and the fills the space with the filling. When the sugar and starches from food and drink gets in contact with decay-causing bacteria they form an acid. This acid affects the enamel of the tooth, losing minerals. Enamel can be retained by the minerals from saliva and fluoride from toothpaste or through the application by the dentist. If tooth decay is neglected it can lead to large cavity, acute pain, infection and eventually tooth loss.