The device (1) has a housing (2) provided with a gripping portion (3), and a fastening device comprising a laterally opened longitudinal slot (5) for holding a dental mouth mirror (6). The fastening device comprises two clamping jaws, where one of the jaws limits the slot and is partially displaced by a clamping screw relative to the other clamping jaw. The two clamping jaws comprise a resilient coating, and a slot-like air supply aperture (8) is arranged parallel to the slot. An air suction opening is formed on an opposite side of the slot.
