Adults over 35 lose more teeth to gum diseases (periodontal disease) than from cavities. Three out of four adults are affected at some time in their life. The best way to prevent cavities and periodontal disease is by good tooth brushing and flossing techniques, performed daily. Periodontal disease and decay are both caused by bacterial plaque. Plaque is a colorless film, which sticks to your teeth at the gum line. Plaque constantly forms on your teeth. By thorough daily brushing and flossing you can remove these germs and help prevent periodontal disease.