Root Canal space is the term that refers to the natural cavity or space within the center of the tooth. It is made up of the pulp chamber which has blood supply and nerves supply toeach tooth.
When the tooth has decayed and infection reaches the pulp chamber it causes a condition known as Pulpitis, it is this condition that we experience sensitivity and pain. When whole of the pulp chamber is infected and we experience increase in pain at night the condition is known as Cronic Irreversible pulpitis.
If we still neglect the tooth then the infection spreads beyond root canal chamber from periapical area leading to formation of a periapical abscess or granuloma.
In order to restore the tooth back to function the dead necrotic pulpal debris are cleaned inside root canals with the help of special instruments and root canals are disinfected and filled with inert matrials to revent further infection.