Root canals treat disorders of the nerve of the tooth. It used to be that a tooth with a diseased or infected nerve had to be removed. In 95 percent of the cases today, however, this is no longer true. The following are the most common factors contributing to a need for root canal treatment: Trauma, such as a physical blow to a tooth or a constant striking of a tooth in the opposite jaw that traumatizes the tooth; Physical irritation caused by a deep decay or a very large filling; Severe gum disease.

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