How a Root Canal Might Save Your Tooth 
When a tooth gets infected, dentists have two remedies: removing the bacteria from the root canal system or extracting the tooth entirely. Keeping as many natural teeth in the mouth as possible is preferable. An artificial tooth can never replace the look or function of a natural tooth.
How it works A root canal has four major stages: preparation, pulp removal, cleaning and sealing the crown. Sometimes, the treatment is carried out in several sessions. In the preparation stage, the dentist will take a series of X-rays to determine if the pulp, the soft tissue of nerves and blood vessels, is inflamed or infected. The dentist will then assess the extent of bacterial damage and determine what treatment is necessary. The dentist will then use an anesthetic to numb the tooth during the procedure. Any infected pulp will be removed and pus will be drained. After the dead or infected pulp gets removed, the root canal will be cleared of any remaining bacteria with a disinfectant solution. It will then be permanently filled and sealed with a ceramic cap called a crown to prevent breakage. Once the process is complete, the tooth can function normally. A treated tooth can last anywhere from 8 to 10 years. However, with good oral hygiene and frequent dental checkups, it can last even longer.
When is it necessary? If a bacterial infection is present, or the pulp is dying, bacteria can multiply and spread. This is when a root canal is necessary. However, there can be times