This is a special procedure that is used to save a tooth that has developed a damaged nerve. The term "root canal" refers to a procedure when the nerve of the tooth is removed. The canal of the root is cleaned, disinfected and hermetically sealed. Root canals are done on teeth that have become infected as a result of decay or injured as a result of trauma. Although they have a bad rap, most of the time a root canal is a relatively simple procedure with little or no discomfort.