
1) Hole in the head
Found on
https://www.crosswordclues.com/clue/oral-cavity

Little Feat - Highwire Act Live in St. Louis 2003 album cover ...
Found on
http://en.wikipedia.org/wiki/Oral_cavity

Refers to the mouth. It includes the lips, the lining inside the cheeks and lips, the front two thirds of the tongue, the upper and lower gums, the floor of the mouth under the tongue, the bony roof of the mouth, and the small area behind the wisdom teeth.
Found on
http://www.cancer.gov/dictionary?expand=O

the mouth.
Found on
http://www.cosmeticdentistryguide.co.uk/glossary.html

The oral cavity is the mouth. The mouth can be defined by boundaries that constitute its extremities. The boundaries of the mouth are the lips and teeth in the front and the soft palate in the rear.
Found on
http://www.dentalfind.com/info/oral-cavity

The region consisting of the vestibulum oris, the narrow cleft between the lips and cheeks, and the teeth and gums, and the cavitas oris propria. ... Synonym: cavitas oris, cavum oris, mouth. ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

the cavity of the mouth, bounded by the jaw bones and associated structures (muscles and mucosa).
Found on
http://www.encyclo.co.uk/local/21001

Cavity of the mouth including the inside of the cheek, palate, oral mucosa, teeth, tongue, and glands that open into the cavity itself.
Found on
http://www.encyclo.co.uk/local/21447

Type: Term Definitions: 1. the region consisting of the vestibulum oris, the narrow cleft between the lips and cheeks, and the teeth and gums, and the cavitas oris propria. Synonyms: cavitas oris, cavum oris, mouth1
Found on
http://www.medilexicon.com/medicaldictionary.php?t=15298
oral fissure noun the opening through which food is taken in and vocalizations emerge; `he stuffed his mouth with candy`
Found on
https://www.encyclo.co.uk/local/20974

The mouth.
Found on
https://www.encyclo.co.uk/local/22445

relating to the mouth cavity.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary---craniofaci
No exact match found.