A cavity is a hole in the tooth that is caused by bacteria that feed on sugar and produce acid. This acid dissolves the minerals in the tooth, creating a cavity. Cavities can be prevented by brushing and flossing regularly, and by avoiding sugary foods and drinks.
Dentists use a variety of tools to detect cavities, including visual exams, X-rays, and probes. However, even the most experienced dentists can miss a cavity, especially if it is small or located in a difficult-to-see area. This is why it is important to see your dentist regularly for checkups and cleanings.