Most common recommended treatment for a infected tooth in pain that can be saved is root canal treatment. Below is a brief video about when and why the treatment is indicated.
A brief video of how a root canal treatment is done is as under. Hope this helps everyone to understand how the procedure is done. Mainly the procedure involves cleaning up of the infected portion of the tooth and roots of the tooth. Once its cleaned its filled with gutta percha material that is biocompatible and seals the tooth roots to prevent any further infection from happening and spreading. Once the tooth is root canal treated it becomes like a glass so it needs to have a cap/crown to prevent any fracture or breaking.