Actually, a root canal is the natural inner cavity of a tooth where the dental pulp chamber and nerve lies. However, in dentistry, a root canal is a type of dental treatment that is used to fix or restore a tooth that has been badly infected or decayed. A root canal is a treatment given to an infected tooth to repair and save it from decaying or being lost. When this dental treatment is carried out, the pulp and nerve are both removed and the inside of the tooth is properly cleaned and sealed. Without root canal treatment, the tissue surrounding the tooth will get infected and may lead to abscesses.
It should be noted that the tooth nerve does not serve any vital importance to dental health. It commences its sensory function only after the emergence of the tooth. It only provides the sensation of cold and hot. Its presence or absence does not in any way affect the daily functioning of the tooth. So, if it is removed, the teeth would still perform its functions.