Root canals are needed when decay and bacteria spread for too long without treatment.
At a certain point, this decay makes it to the pulp inside the tooth. This pulp includes nerves, therefore infection generally causes a lot of pain. Since this is happening on the inside of the tooth, you won’t necessarily see the damage. Instead, you could feel it through pain and notice other signs that include bleeding, swelling and bad breath.
Without catching the problem soon enough or if you avoid dental care due to fear of a root canal, you could end up losing the tooth and/or having a broader infection throughout your mouth. These problems would actually result in more extensive treatment than a root canal requires.
At times, If your tooth becomes infected and isn’t treated, the infection could spread to other places in your body known as sepsis.