Device for activating mandibular growth, maxillary growth and mandibular advancement comprising: - a first rod (3) comprising a front end (9) and a rear end (10)； - a second rod (4) comprising a front end (11) and a rear end (12)； - said first (3) and second (4) rods are relatively rigid and have different lengths from each other； - a first pivotal joint (6) capable of connecting the front end (9) of the first rod (3) to a first dental arch of a person； - a second pivoting joint (8) suitable for connecting the front end of the second rod (4) to a second dental arch of the person； - a third pivotal joint (7) that connects the rear ends (10,12) of the rods (3,4) together allowing the device to move from an open position to a closed position in order to follow the opening movement and of closing of the jaws, characterized in that said third pivoting joint (7) is apt to be connected to the dental arch that supports the shorter rod by means of elastic means (5) to return the device to the closed position so that said rods are suitable to induce a relative displacement of the mandibular arch with respect to the maxillary arch in the jaw closing position.Dispositivo de activación del crecimiento mandibular, del crecimiento maxilar y de avance mandibular que comprende: - una primera varilla (3) que comprende un extremo frontal (9) y un extremo posterior (10)； - una segunda varilla (4) que comprende un extremo frontal (11) y un extremo posterior (12)； - dichas primera (3) y segunda (4) varillas son relativamente rígidas y tienen unas longitudes diferentes la una respecto a la otra； - una primera articulación pivotante (6) apta para de conectar el extremo frontal (9) de la primera varilla (3) a un primer arco dental de una persona； - una segunda articulación pivotante (8) apta para de conectar el extremo frontal de la segunda varilla (4) a un segundo arco dental de la persona； - una tercera articulación pivotante (7) que conecta entre sí los extremos posteriores (10,12) de la
