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.
The dentin is the hard tissue that makes up the core of each tooth. It's the part of a tooth that lies underneath the enamel, which covers the outside of teeth, and the cementum, which covers the roots. The dentin is yellowish and contains tiny openings that lead to the nerves and cells inside the tooth.