Tenn. Code Ann. § 63-25-113

Any person licensed to practice by this chapter, who has retired or may hereafter retire from such practice in this state, shall not be made to register as required by this chapter if such person files with this board an affidavit on a form to be furnished by the board, which affidavit states the date on which such person retired from such practice, and such other facts as tend to verify such retirement as the board deems necessary. If such person reengages in such practice in this state, such person shall apply for licensure with the board as provided by this chapter, and shall meet other requirements as may be set by the board.