Concealed hinge for furniture doors and doors and windows comprising: - a first body (1, 10, 3) applicable to a door - a second body (2, 3) applicable to a jamb - the first body (1, 10, 3) receives a pin for pivoting a first end of a first arm, the second end of which has teeth engaged in a path defined by each of the second guides made inside a second body (2, 20, 8) - the second body (2, 20, 8) receives a second pin for pivoting a first end of a second arm, the second end of which has teeth engaged in a path defined by each of the first guides made inside said first body (1, 10, 3), - said first arm being pivoted to the second arm through a pin parallel to the axis of reference Z that is parallel to the axis of rotation of the door in relation to the jamb characterised in that the path defined by the second guides comprises: - a straight first portion parallel to the X axis, that identifies the full depth of the second body, said straight first portion being near the bottom of the second body (2, 20, 8), - a curved intermediate portion adjacent to the first straight portion and adequately connected to it, in which said intermediate portion deviates from the ideal line joining the exact opposite positions of the curving path inside the second guides and in which said curved intermediate portion is made with concavity facing a decreasing direction of the axis of reference Y completing the Cartesian group of said X and Z axes, said decreasing direction of the axis of reference Y being opposite to the one for the opening of said door - a straight final portion that is parallel to the X axis, adjacent to the curved intermediate portion and adequately connected to it, said straight final portion being near the top of the second body (2, 20, 8). - a first body (1, 10, 3) applicable to a door - a second body (2, 3) applicable to a jamb - the first body (1, 10, 3) receives a pin for pivoting a first end of a first arm, the second end of which has teeth engaged in a path defined by each of the second guides made inside a second body (2, 20, 8) - the second body (2, 20, 8) receives a second pin for pivoting a first end of a second arm, the second end of which has teeth engaged in a path defined by each of the first guides made inside said first body (1, 10, 3), - said first arm being pivoted to the second arm through a pin parallel to the axis of reference Z that is parallel to the axis of rotation of the door in relation to the jamb - a straight first portion parallel to the X axis, that identifies the full depth of the second body, said straight first portion being near the bottom of the second body (2, 20, 8), - a curved intermediate portion adjacent to the first straight portion and adequately connected to it, in which said intermediate portion deviates from the ideal line joining the exact opposite positions of the curving path inside the second guides and in which said curved intermediate portion is made with concavity facing a decreasing direction of the axis of reference Y completing the Cartesian group of said X and Z axes, said decreasing direction of the axis of reference Y being opposite to the one for the opening of said door - a straight final portion that is parallel to the X axis, adjacent to the curved intermediate portion and adequately connected to it, said straight final portion being near the top of the second body (2, 20, 8).