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A RealAge answered. A dentist may prescribe antibiotics before a root canal procedure to improve the chances of a successful outcome. Antibiotics are usually continued after the procedure as well. The dentist may also recommend the use of a nonsteroidal anti-inflammatory medicine like ibuprofen or naproxen (available over the counter), or oxaprozin or ketoralac (prescription only) after the procedure. This can reduce inflammation and improve healing.
Any trauma or infection of the nerve will result in the need for root canal therapy. Common reasons for root canal therapy include: Tooth decay invades the tooth, penetrating through the enamel and then the dentin in to the pulp. A tooth has become abscessed -- also known as infected -- from decay.