To describe a tooth with a hole in it, you can say that the tooth has a "cavity." For example, you can say "I have a cavity in my molar" or "My dentist told me that I have a cavity in one of my front teeth." A cavity is a small hole or depression in a surface, and in the case of a tooth, it is caused by tooth decay. Tooth decay is the process by which the outer protective layer of a tooth, called the enamel, is damaged and broken down by bacteria. When bacteria produce acid that erodes the enamel, it can create a cavity in the tooth. If you have a cavity, it is important to see a dentist as soon as possible to have it filled or treated, as untreated cavities can lead to more serious problems such as tooth loss or infection.
