Gingiva, commonly known as the GUM, is a specialized tissue that lines the mouth and covers the alveolar bone. It is composed of an outer layer of epithelium and an inner layer of connective tissue. The GUMS are responsible for protecting the teeth and providing support to the surrounding structures. They also help to keep food particles from entering the bloodstream. In addition, they provide lubrication for the teeth and help to maintain the health of the oral cavity.