Performing a correct root canal therapy is not simple and is not always effective, in fact the anatomy of the endodontum can reserve surprises.
In any case, in the vast majority of clinical situations it is possible to recover the tooth and keep it still perfectly efficient in the mouth for several years. Very often devitalized teeth becoming more fragile need to be encapsulated.
Devitalization consists in opening the pulp chamber (= the housing of the nerve) and using very elastic instruments to clean the canals, regulating their shape; during these maneuvers, chemicals are used to clean and disinfect the channels. Once the canals have been cleaned and the length of the roots established, they are closed using an inert material (usually gutta-percha).