CROWN:It is the part of the tooth, visible in mouth.
ROOT:It is the part of the tooth not visible in mouth [hidden underneath gums].
ENAMEL:Outermost covering of the tooth [most hardest tissue of the body, even harder than bone.]
DENTIN:underlying enamel, less harder, it is sensitive because it is present closer to the vital dental tissue, the PULP, which is soft due to the presence of substance called collagen [will be discussed later]. Pulp contains nerve and vessels, has the capability of regeneration and provides nutrition for the tooth.
CEMENTUM:It is hard, present in root region, covering and protecting dentin.
Nerves and vessels enter the tooth from below [as shown in diagram] through an opening called APICAL FORAMEN.
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