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 different parts of a tooth are: the crown, which is the part you can see above the gum line; the neck, where the crown meets the root; the root, which is the part that extends into the jawbone; the enamel, which is the shell that covers the visible part of the tooth; the cementum, which covers the roots