A root canal might be needed if the cause of the toothache is determined to be an infection of the tooth's nerve. Bacteria that have worked their way into the inner aspects of the tooth cause such an infection. An antibiotic may be prescribed if there is fever or swelling of the jaw.
Definition of correspondence for Students. 1  1 : communication by means of letters or e-mail : the letters or e-mail exchanged. 2  2 : agreement between certain things Sometimes there is little correspondence between the spelling and the pronunciation of a word.
The definition of complicated is someone or something that is hard to understand or something that is hard to untangle. 1  A romantic relationship that involves more than two people is an example of complicated. 2  A Rubik's Cube is an example of a complicated puzzle.