The interior of the normal human mouth is generally divided into soft and hard tissues. The hard tissues associated with the oral cavity are our common maxilla and mandible, the maxilla forms the upper part of the mouth and forms the upper side of the alveolar bone to carry the teeth of the upper jaw, and the mandible is the only piece of bone in the maxillofacial region that can be movable, and it carries the form of the lower 1/3 of the face and the teeth of the lower jaw. In addition according to the outer and inner teeth can be divided into oral vestibule and intrinsic oral cavity, oral vestibule that is the part between our lips and teeth, between which there are some lip and cheek ties. In the intrinsic oral cavity we generally have the body of the tongue and the tissues of the sublingual and palatal regions, which together make up our oral cavity.