Dental fillings or restorations are a type of dental treatment that is used to restore the beauty and function of teeth. Dental fillings are used to repair tooth decay, tooth fractures, minor tooth abrasion, and tooth surface injuries. A common complication of tooth decay is the loss of tooth enamel, which increases the sensitivity of the teeth. In most cases, it is possible for fillings to treat the teeth in this way. But in some cases, depending on the type of complication, additional treatments may be needed.