When decay or tooth breakdown penetrates through the tooth the internal nerve eventually becomes damaged and dies. Once the internal blood and nerve tissue become necrotic (dead) the bodies defense system begins to attack the tooth as a foreign body, an infection begins and the painful abscess results.

The decay is then removed and an access is made into the nerve chamber.

The necrotic tissue is removed and the canal space is cleaned and sterilized.

The canal space is then filled with a non-reactive filling material and the canals are sealed.

Often a post is placed to help anchor the filling to rebuild the broken-down area of the tooth.

The final step is to place a crown on the tooth to protect it from fracturing as the tooth will now be brittle without blood supply.