A root canal is a treatment used to repair and save a tooth that is badly decayed or becomes infected. Duringa root canal procedure, the nerve and pulp are removed and the inside of the tooth is cleaned and sealed. Without treatment, the tissue surrounding the tooth will become infected and abscesses may form.
Root canal treatment is an extremely beneficial option that allows for most teeth to be saved in the mouth and used effectively for a very long time. Once the teeth are formed, they don't need the pulp to function properly. The pulp provides the tooth sensation to a stimulus like hot or cold, but it isn't required for the tooth to remain functional in a healthy mouth.