Dental fillings (restorations) are used to replace tooth structure that is decayed. Caries can be detected through direct observation or x-rays. Dental fillings are also used to repair fractured, broken, or severely worn teeth.The dentist will proceed to cavity preparation, removing any remaining decay and shaping the final cavity. The next step will be the addition of composite-resin filling material, cured (hardened) after with a curing light. The final step will be polishing the filling to adapt it smoothly to the natural shape of the tooth.