Plaque is actually bacteria that cause cavities and gum disease. It forms on your teeth constantly. However, plaque can be removed by brushing and flossing. That is why we recommend brushing four times a day—after meals and at bedtime, and floss at bedtime, too. Floss is needed because the toothbrush does not go in between the teeth and that is where most of the disease occurs. Bacterial plaques favorite food is sugar—enough said?