When the bacteria in your mouth interacts with sugar, it creates acid that breaks down your teeth, forming cavities, also called caries or decay. Cavities can sometimes be dark in color, feel like holes or soft areas on your teeth, but many times you will not be able to feel a cavity. In fact, most people never feel pain or sensitivity with cavities; they cannot be detected without x-rays and a thorough oral exam. In order to fix the cavity, the area can be numbed with local anesthetic, and then the soft area of the tooth needs to be removed and replaced with a filling material. At our office, we place white composite (not silver amalgam) fillings and use the highest quality materials.