There are nerve and blood vessels in the center of every tooth that keep it vital. This can get infected due to a very deep decay, faulty crown, trauma or injury. Then, the root canal therapy is necessary to save the tooth. The infected tooth usually causes some pain and sensitivity and if not treated on a timely manner, it can lead to swelling, severe pain and an abscess.
Root canal therapy includes removing the decay and infected tissue. The canals of the tooth get shaped and disinfected, then they are filled and sealed with elastic material. The tooth is non vital and it gets very brittle over time. A crown restoration is necessary to protect the tooth from fracture.