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Root canal treatment commonly involves removing the inflamed or infected dental pulp. The dental pulp is the part of the tooth that allows us to feel temperature and alerts us to the presence of a problem like tooth decay. When bacteria enter the pulp through cracks, decay or following a bump or knock to the tooth, the pulp becomes inflamed, and the tooth and surrounding area will become sore. Common symptoms are increased sensitivity to temperature (hot and cold), spontaneous aching, pain with biting or pressure and swelling. Any of those symptoms may indicate the need for root canal treatment.