Brushing can miss a billion germs, which may lead to various oral problems. Listerine reaches all parts of your mouth, removes 99.9% of germs and helps strengthen teeth and prevent cavities. The power of 4 essential oils combined with sodium fluoride in Listerine Cavity Fighter mouthwash helps strengthen teeth and prevent cavities. Ideal for those who have orthodontic attachments helps to clean the areas in the mouth which brushing misses.