Bacteria in your mouth are not picky eaters. They like sugar no matter where it comes from, and the more sugar the better. These bacteria eat the sugar and make acid byproducts which burn holes in the teeth called cavities. The best ways to avoid cavities are to reduce your sugar intake and to remove the sugars that are on your teeth with proper brushing and flossing. In addition, you should see your dentist every six months to have your teeth checked. Small cavities can be fixed with conservative fillings. However, larger cavities that are allowed to grow can lead to pain and the need for more extensive restorations like root canal treatment and crowns.