Mouth receives food and begins digestion by mechanically breaking up the solid food particles into smaller pieces and mixing them with saliva.
More importantly, Mouth plays a significant role in communication. While primary aspects of the voice are produced in the throat, the Mouth's tongue, lips, and jaw are also needed to produce the range of sounds included in human language.
Another non-digestive function of Mouth is its role in secondary social and/or sexual activity, such as kissing--the physical appearance of Mouth and lips play a part in defining sexual attractiveness.
