An oral hygiene device is disclosed having at least two motors to simultaneously vibrate and impart motion upon the head portion of the oral hygiene device, most beneficially at the tip. The display device includes a display unit configured to display a pointer and a controller configured to differently control a motion of the pointer corresponding to a moving distance of a pointing part depending on a distance from the pointing part inputting a gesture command. The frequency determiner determines a frequency for determining a time period of a detecting operation to detect differential quantum efficiency of the laser diode. A scissors linkage mechanism interconnects the hydraulic cylinder and the frame assemblies to effect proper movement thereof.