Plaque, a sticky film of bacteria, constantly forms on your teeth. When you eat or drink foods containing sugars, the bacteria in plaque produce acids that attack tooth enamel. This is when cavities can form. If not treated, it can grow into the deeper layers of the tooth, but you can avoid cavities by brushing, flossing, and regularly taking your child to see the dentist. Composite restorations (white fillings) are used for primary and permanent teeth after the removal of tooth decay.