Root canal therapy is required if your tooth becomes infected, which most often happens one of two ways:
A serious cavity can eat away at the outer layers of your enamel and dentin until it reaches the pulp. Once the pulp, which is responsible for keeping your tooth alive, is exposed, it becomes vulnerable to bacteria and becomes infected.
Dental trauma that cracks or chips a tooth can expose the nerve and blood vessel-filled pulp to oral bacteria.
If left untreated, either situation will lead to the infection, decay, and eventual death of your tooth’s pulp.
When the infection starts to take hold, you’ll likely begin experiencing an array of symptoms like a toothache, inflamed gums near the tooth, and tooth sensitivity.