Root canal treatment becomes necessary when a cavity is allowed, through neglect, to spread all the way to the pulp. Sometimes deep restorations or trauma to a tooth can cause the nerve to be damaged to the point that it needs root canal therapy.
If an infection is allowed to continue, it can begin to eat away at surrounding bone, causing an abscess. An abscess can weaken your entire immune system and can be extremely painful.
An infected nerve cannot heal on its own. So it’s vital that you have your dentist assess and treat your condition and recommend any additional therapies.