Like a vestibule is an interior entry in a building, an oral vestibule is like the entryway to your mouth. Located between your lips/cheeks and teeth/gums, a healthy oral vestibule is usually the perfect size for your natural teeth.
But if you need dentures, you might require a surgery known as vestibuloplasty, often performed before placement of a prosthetic. The benefit this pre-prosthetic surgery provides is to deepen your oral vestibule to allow for more surface area and space for full dentures, partial dentures, or implants. Widening the area might also make it easier to maintain good hygiene around the replacement teeth.