A fiber optic module includes a housing defining an interior region. One end of the column body has a U-shaped handle that has two through holes on both sides of the column body corresponding to the engaging ribs of the column body, so that the handle is able to conjugate the engaging ribs at the outer surface of the column body through the through holes. A pair of axles is attached to the housing and each has a pair of free ends. A plurality of bristles is coupled to and extends from the head. Pharmaceutical formulations including glutathione are also disclosed.