The goal of the procedure is to save a tooth that is severely infected.
As the National Institutes of Health puts it, a dentist performs the procedure to remove bacteria and dying or dead tissue from inside the tooth.
Modern techniques and technology have helped root canals evolve into relatively comfortable treatments that often require no more than one or two trips to the dentist or endodontist.
Usually, root canals are recommended or needed when there is an infection deep within the tooth.
The pulp inside the tooth can become infected with bacteria, because of an injury or because of a severe, untreated cavity.
Without treatment, the infection can become severe enough that the tooth has to be removed.
Using a needle, the dentist administers local anesthesia to numb the tooth.
It's common to feel a bit of a pinch in the area when the needle goes in.
After the tooth is numb, the endodontist might place a dental dam, a small sheet of rubber that isolates the tooth to keep it clean and dry during the procedure.
The dentist will then use very small tools, such as a small drill, to access the inside of the tooth by creating an opening in the top portion of the tooth.
The dentist will use small files to clear away the damaged and diseased pulp from the inside of the tooth.
He will also use the files to shape the inner chamber of the tooth and root and might irrigate the chamber with water to wash away any remaining pulp.
He might also put an antimicrobial solution in the chamber to kill any remaining bacteria and reduce the risk for further infection.
Once the chamber is thoroughly cleaned and dried, the endodontist will fill it.
A rubber-like material called gutta percha is often used.
The dentist will close the opening in your tooth with a temporary filling, while you wait for the permanent crown.
After a few weeks, the dentist will finish the treatment by placing a permanent crown or a similar type of restoration on the top of the tooth.
Depending on the condition of your natural tooth, the dentist may need to place a small supporting post inside of the root chamber, to make the crown or restoration more stable.