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I assume you are talking about going to a dentist and having a root canal therapy performed on the tooth. This procedure removes the nerve and blood supply of the tooth. The interior of the tooth is then filled with an inert rubber material called gutta percha.

The most common risks associated with a root canal are pain during the procedure that is usually effectively controlled with local anesthetics; pain after the procedure as the healing process begins, usually managed with OTC or prescription pain medication and antibiotics; failure of the root canal therapy, which may require either a second procedure or a surgical procedure called an apicoectomy and retrofill or extraction of the tooth.

Assuming that the root canal therapy is successful, most teeth will soon require a crown restoration because the tooth will tend to become brittle and fracture. Having a crown placed prior to the fracture is highly recommended. Sometimes a root canal tooth will turn dark from the inside out. This will become a cosmetic concern if it is a front tooth visible when you smile or talk.

Most root canal teeth can last many years, often a lifetime. However, sometimes root canal teeth will fail many years later for no apparent reason. Depending on the specific situation, the root canal may be repeated.

For the best information, you should seek out a quality dentist and discuss the risks, benefits, and alternatives with him/her.

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Q: What is the risk of killing a nerve of a tooth that is causing you pain?
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