The oral cavity, or the mouth or buccal cavity serves as the first portion of the digestive system, It consists of the lips, tongue, palate, and teeth, The mouth is important to several bodily functions, such as breathing, speaking, chewing, drinking, swallowing, talking, tasting, digesting food and drinks. This oval-shaped opening in your skull starts at your lips and ends at your throat, the mouth allows air and nutrients to enter your body, and it helps you speak.