The main reason our patients need dental fillings is for cavities. Cavities are created by tooth decay that develops into tiny holes. They can occur because of poor oral hygiene, bacteria in the mouth, drinking sugary drinks, and candy. When this combination of sugar, bacteria, acid, and food mix together, plaque begins to build up. If this plaque doesn’t get removed, cavities will most likely form. They are most commonly found in areas of the mouth difficult to reach and properly clean with your toothbrush. Additional reasons you may need a dental filling include stains on the surface of your teeth, chips, and small cracks.