The area inside of the dental arches is considered to be the:

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The oral cavity includes the area inside the dental arches as well as the tongue, floor of the mouth, and hard and soft palate. The buccal vestibule is the space between the lips or cheeks and the teeth or alveolar ridge. The isthmus of fauces is the opening between the oral cavity and the pharynx. The faucial pillars are the folds of tissue on either side of the oropharynx.

The Area Inside of the Dental Arches Is Considered to Be