Medical, in particular dental, treatment chair having a backrest and a headrest, wherein the headrest is coupled to the backrest in a height-adjustable manner by motor via an electric drive and is furthermore manually pivotable about a pivot axis oriented perpendicular to the direction of height adjustability, so as to be able to set an angle of inclination (α) between a plane of the backrest and a plane of the headrest, characterized in that the treatment chair has control means which, upon manual adjustment of the angle of inclination (α) between the plane of the backrest and the plane of the headrest, are designed to control an adjustment of a height position of the headrest by motor via the electric drive, wherein the control means comprise an electronic control circuit and a sensor for detecting the angle of inclination (α) between the plane of the backrest and the plane of the headrest, and wherein the control means are designed for the following: i. after adjustment of the angle of inclination (α) between the plane of the backrest and the plane of the headrest, to generate, with the aid of the sensor, a control parameter corresponding to the set angle (α), which control parameter is used as an input signal for the electronic control circuit, ii. and, depending on the determined angle of inclination (α), to generate, with the aid of the control unit, a suitable compensation value for actuation of the drive, so as to control the latter in such a way that • in the event of a reduction in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is increased, and • in the event of an increase in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is reduced. wherein the headrest is coupled to the backrest in a height-adjustable manner by motor via an electric drive and is furthermore manually pivotable about a pivot axis oriented perpendicular to the direction of height adjustability, so as to be able to set an angle of inclination (α) between a plane of the backrest and a plane of the headrest, characterized in that the treatment chair has control means which, upon manual adjustment of the angle of inclination (α) between the plane of the backrest and the plane of the headrest, are designed to control an adjustment of a height position of the headrest by motor via the electric drive, wherein the control means comprise an electronic control circuit and a sensor for detecting the angle of inclination (α) between the plane of the backrest and the plane of the headrest, and wherein the control means are designed for the following: i. after adjustment of the angle of inclination (α) between the plane of the backrest and the plane of the headrest, to generate, with the aid of the sensor, a control parameter corresponding to the set angle (α), which control parameter is used as an input signal for the electronic control circuit, ii. and, depending on the determined angle of inclination (α), to generate, with the aid of the control unit, a suitable compensation value for actuation of the drive, so as to control the latter in such a way that • in the event of a reduction in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is increased, and • in the event of an increase in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is reduced. i. after adjustment of the angle of inclination (α) between the plane of the backrest and the plane of the headrest, to generate, with the aid of the sensor, a control parameter corresponding to the set angle (α), which control parameter is used as an input signal for the electronic control circuit, ii. and, depending on the determined angle of inclination (α), to generate, with the aid of the control unit, a suitable compensation value for actuation of the drive, so as to control the latter in such a way that • in the event of a reduction in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is increased, and • in the event of an increase in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is reduced. • in the event of a reduction in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is increased, and • in the event of an increase in the angle of inclination (α) between the plane of the backrest and the plane of the headrest, a distance (d) between the backrest and the headrest is reduced.