The mouth is an opening in the face is the first part of the alimentary canal (digestive system). It is the place where the chewing of food occurs. 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. The tongue, lips, and jaw, which are parts of the mouth, are needed to produce the range of sounds included in human language. People also kiss and show their emotions with the mouth.