Root canals (also called endodontics) are beneficial if you have a tooth whose internal structures are damaged. Root canal therapy can restore your tooth to its state of health by treating the damaged part of your tooth.
Inside each tooth is the pulp which provides nutrients and nerves to the tooth, it runs like a thread down through the root. When the pulp is diseased or injured, the pulp tissue dies. If you don't remove it, your tooth gets infected and you could lose it. After the dentist removes the pulp, the root canal is cleaned and sealed off to protect it. Then your dentist may chose to place a crown over the tooth to help make it stronger.
Most of the time, a root canal is a relatively simple procedure with little or no discomfort involving one to three visits.