If you search the web, you will find many websites that describe the root canal as a procedure that kills a tooth. But when you understand the science behind it, it can influence your opinion.
The pulp chamber, or inside of a tooth, has nerves and blood vessels which were there initially to help the tooth develop, grow and erupt in the mouth of a child or a teenager. Later in life the nerves can cause pain, helping a person knowing that there is something wrong going on with the tooth.
A root canal is done when the pulp chamber is infected. The dentist removes what’s inside the pulp, cleans, disinfects and fills each canal. The tooth will no longer have nerves or blood vessels.
In my opinion, a tooth is not “killed” after undergoing a root canal. It is simply allowed to heal properly after being decayed or infected, and will continue allowing a person to use it while eating and chewing.