oral cavity

space within the mouth

The human mouth (or oral cavity) is covered by an upper and lower lip. The mouth starts digestion by physically chewing the food and breaking it down with saliva.The average male mouth holds a volume of about 100mL.
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Oral cavity n. The part of the mouth behind the teeth and gums that is bounded above by the hard and soft palates and below by the tongue and the [more]Oral cavity - Community and Resources

Noun
1. the opening through which food is taken in and vocalizations emerge; "he stuffed his mouth with candy"
(synonym) mouth, oral fissure, rima oris
(hypernym) rima
(hyponym) trap, cakehole, hole, maw, yap, gob
(part-holonym) mouth
(part-meronym) dentition, teeth

The mouth.