Oral Cavity -Gateway of your body

 The first thing that comes to mind when you think of your mouth is probably eating. The part of the mouth behind the teeth and gums that is bounded above by the palate and below by the tongue and the inner part of the mandible.

your mouth and teeth form your smile, which is often the first thing people notice when they look at you. The mouth is also essential for speech: The tongue (which also allows us to taste) enables us to form words with the help of our lips and teeth. The tongue hits the teeth to make certain sounds — the th sound, for example, is produced when the tongue brushes against the upper row of teeth. If a person has a lisp, that means the tongue touches the teeth instead of directly behind them when saying words with the s sound.

Without our teeth, we'd have to live on a liquid diet or a diet of soft, mashed food. The hardest substances in the body, the teeth are necessary for mastication — a fancy way of saying chewing — the process by which we tear, cut, and grind food in preparation for swallowing.

Chewing allows enzymes and lubricants released in the mouth to further digest, or break down, food. This makes the mouth one of the first steps in the digestive process.