SmileDirectClub Inc. /zigman2/quotes/214109287/composite SDC +1.93% said late Tuesday its Chief Financial Officer Kyle Wailes has resigned to "pursue a CEO opportunity at a health care company." Wailes will remain in his role through March 1, will continue to own a "significant" amount of equity in the company, SmileDirect said. It did not specify the health care company. SmileDirect hired an external executive-search firm to find its next CFO. Shares of SmileDirect fell 1.6% in the extended session Tuesday after ending the regular trading day up 9%.