All teeth have root canals. These canals are filled with a network of nerves and tissue known as pulp. Sometimes the pulp can become inflamed or infected. When teeth are growing, pulp helps to nourish them, but as teeth mature, the pulp can safely be removed. This procedure can save teeth from eventually being lost or having to be removed. Once the infected pulp is removed, a post is placed and a crown is placed over the tooth.