Tooth Decay describes the break down of strong healthy teeth over time. Your tooth's surface is composed of a hard mineral coating called enamel. Enamel is the hardest tissue in your body, but by no means indestructible. Actually, enamel is exposed to bacteria all day which produce plaque. Plaque is the substance that covers your teeth and eats away at the enamel causing the holes known as cavities. Brushing your teeth, flossing and regular dental visits will help keep plaque under control. Leaving plaque on your teeth leads to tartar buildup which brushing and flossing alone can not remove. Letting plaque get out of control can lead to many oral problems ranging from bad breath and cavities to gum recession Periodontal disease and tooth loss.