Endodontic therapy or root canal therapy is used to save a damaged tooth without having to remove it. When a cavity goes untreated it can reach the pulp of the tooth, all the way in the center, and the tooth then become infected. Trauma can also cause the nerve of a tooth to be severely damaged. Once either of these conditions occur it begins to eat away at the surrounding bone (this is called an abscess). If a tooth is infected the only option is a root canal treatment since the tooth cannot heal on its own. A root canal is performed to clean out the infected tooth pulp and disinfect the canals of the tooth. Once completed a crown is usually recommended to cover the tooth and protect it from another cavity. The only other option to treat an infected pulp is extracting tooth. The longer an individual goes without treating an infected tooth can cause a weakened immune system. Symptoms of an infected pulp can be sensitivity to hot or cold, sweets, pain, swelling, pain when biting and a bad taste in mouth, however, there are instances where there are no symptoms and the problems is only discovered at the yearly check up.