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While teeth are hard calcified objects, they are not completely solid. In the inner most aspect of every tooth there lies a hollow space which, when a tooth is healthy, contains the tooth’s nerve tissue. Dentists use the following terms to refer to various portions of this nerve area:

The pulp chamber: This is a hollow space that lies more or less in the center of the tooth.

The root canals: Each tooth’s nerve enters the tooth, in generalities, at the tip of its root(s). From this point the nerve then runs through the center of the root in small “root canals” which subsequently join up with the tooth’s pulp chamber.