Mouth, online at mouth.com, save money on hot items when shopping on Mouth when applying our coupons, promo codes during checkout. Trust us, these coupons are good. Make the best of our Mouth promo codes to get $25 OFF. All discounts are totally free to use. In animal anatomy, the mouth , also known as the oral cavity , buccal cavity , or in Latin cavum oris , is the opening through which many animals take in food and issue vocal sounds. It is also the cavity lying at the upper end of the alimentary canal, bounded on the outside by the lips and inside by the pharynx and containing in higher vertebrates the tongue and teeth. This cavity is also known as the buccal cavity derived from the Latin bucca meaning a "cheek".Some animal phyla, including vertebrates, have a complete digestive system, with a mouth at one end and an anus at the other. Which end forms first in ontogeny is a criterion used to classify animals into protostome and deuterostome.