A device for mandibular advancement, including a tube and a telescopic rod associated with the tube, in which the tube and the telescopic rod can be associated to the teeth of the upper and lower arches, in which the telescopic rod includes a threaded pin which engages a female thread of a hollow element slidably positioned in said tube, and the hollow element includes a maneuvering portion external to the tube; the device includes a friction element, arranged between the inner walls of the maneuvering portion and the thread of the pin and having an outer surface which is complementary to the inner walls of said maneuvering portion and a threaded internal cavity which copies the thread of the pin.