In such situations, the options are either root canal treatment (RCT) or extraction. RCT is the preferred option in order to save the tooth (provided the tooth has a good prognosis otherwise). Usually, two or more appointments are required for an RCT, however, some cases can be completed in one visit depending on the level of infection, which tooth is being treated in relation to how many canals it has and ability to access, size and shape of the roots and whether the tooth has been previously root treated.