The mouth is an opening in the face where we put food when we eat. It is the place where mastication occurs, and it is the first part of the alimentary canal (digestive system).
The mouth has teeth to help chew the food. In addition to its primary role as the beginning of the digestive system, in humans the mouth also plays a significant role in communication. While main creators of the voice are produced in the throat, the tongue, lips, and jaw, they are also needed to produce the range of sounds included in human language. We also kiss and show our emotions with it.