Root Canal treatment can save your tooth. The pulp or soft tissue inside of the tooth, contains blood vessels and nerves and can become diseased or injured and unable to repair itself. The most common causes of pulp death are a cracked tooth, a deep cavity, problems with large fillings, or serious injury to the tooth. All of these can allow bacteria to enter into the pulp, resulting in infection. Bacteria can damage the bone that anchors the tooth in the jaw, without treatment, the tooth may have to be extracted. A root canal involves the pulp being removed from the inside of the tooth, each root canal is cleaned and shaped so that it can be filled and the tooth can be restored.