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Noun[edit] cavity â(plural cavities) 1  A hole or hollow depression. 2  A hollow area within the body (such as the sinuses). ( dentistry) A soft area in a decayed tooth.
Cavity (Definition) Basically a cavity is a hole, or defect in the tooth structure. It is created by the demineralization and breakdown of tooth structure from the acid attack of bacteria in the mouth. ...Read more.