In a standard root canal treatment, a series of files are used to reach inside the tooth and mechanically remove the infected tissue. For decades, it has been the prevailing method of cleaning root canal systems.
Root canal systems, however, are highly complex, with twists and turns that make it difficult for files to reach everywhere. In addition, there are microscopic places along the canal walls where bacteria can hide.
The bacteria left behind will continue to multiply, which can cause the infection to return. As a result, you may find that you require another root canal treatment down the road.