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.
Receiving a letter is one form of communication. The definition of communication is the 2-way exchange of opinions, news and information by writing, speech or gestures including body language and facial reactions. Mailing a letter to a friend, sending an email to a co-worker, calling a friend on the telephone, having a discussion and sending a text message are each an example of communication.