A Cementoblast is a biological cell that forms from the follicular cells around the root of a tooth, and whose biological function is cementogenesis, which is the creation of cementum. Cementum is the hard tissue that covers the root of the tooth. Cells in culture, stained for keratin (red) and DNA (green) The cell is the structural and functional unit of all living organisms, and are sometimes called the building blocks of life. ... Types of teeth Molars are used for grinding up foods Carnassials are used for slicing food. ... Cementum is a specialized bony substance covering the root of a tooth. ...