The oral vestibule is partially bordered by the lips and cheeks. The oral cavity proper extends posteriorly to the soft palate.

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The oral vestibule is the space or potential space that exists between the lips or cheeks and the teeth. In an edentulous person, the vestibule would extend between the lips or cheeks and the alveolar ridges. The oral cavity proper is surrounded by the teeth or alveolar ridges and extends all the way back to the palatine tonsils. This includes the region from the floor of the mouth upward to the hard and soft palates.

The Oral Vestibule Is Partially Bordered by the Lips and Cheeks