Sources: American Heart Association. Heart Disease and Stroke Statistics - 2009 Update; CDC, Heart Disease and Stroke Prevention Addressing the Nation's Leading Killers, At A Glance, 2011. Heart disease and stroke are the first and fourth leading causes of death in the United States.
Your teeth are composed of four dental tissues. Three of themâenamel, dentin and cementumâare hard tissues. The fourth tissueâpulp, or the center of the tooth that contains nerves, blood vessels and connective tissueâis a soft, or non-calcified, tissue.
Teeth consist of several components: 1  Enamel is the hardest and most highly mineralized substance of the body. 2  Dentin is the substance between enamel or cementum and the pulp chamber. 3  Cementum is a specialized bony substance covering the root of a tooth.  Pulp is the central part of the tooth filled with soft connective tissue.