Simple...: A cavity, by definition: cav·i·ty (kăv′ĭ-tē) 1. A hollow; a hole. 2. A hollow area within the body: a sinus cavity. 3. A pitted area in a tooth caused by caries. A filling (dental restoration) is place into a cleaned out tooth cavity to protect the tooth from further decay and to restore the tooth to proper form and function.
Answered 4/6/2014
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