Tenn. Code Ann. § 63-6-808

Any person who has been issued a license to practice under this part and who wishes to retire the license shall file with the board an affidavit, on a form to be furnished by the board, stating the date on which the person retired from practice and any other information deemed necessary by the board. If that person decides to reengage in practice in this state, the person shall apply for licensure as provided by this part and shall not be liable for licensure renewal fees that accrued during the period of retirement.