When the bacteria eating a tooth in a cavity spread large enough, it can infect the nerve in the center of the tooth. In this small space, as a result, the tissue wants to swell and pressure increases with no release. This creates a painful throbbing for many people.
Dentists remove the infection performing root canal therapy, in which the canals in the roots are cleaned and filled with a biocompatible material - usually guttapercha.
So yes, the way the tooth got in this situation is usually painful, but a root canal procedure is actually no more painful than any other procedure. It can take time, but after anesthesia it is a piece of cake!
Great pic tells all! Thanks to Coast Dental.
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