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.
Tooth composition. 1. Dentin-the bulk of the tooth. It is calcified connective tissue. It is similar to, but harder than bone (has more Ca2) 2. Pulp Cavity within the crown. It contains pulp (which is N.A.V.a.L.). It exits via the root canal 3. Enamel-the hardest biological substance. It covers the dentin of the crown.