The tutor of this invention is made up of a support (1) to be fixed to the chest of the user with a chin rest (2) being connected to the support (1) through a hinge (7) and also being anchored at an element (3) provided on the patient's neck, and of a plate (4) positioned on the convexity of the patient's dorsal curve and having applied thereto a posteroanterior thrust. The said chin rest (2) is engaged to a means (8) articulated to the support element (1) in a central position with respect to the chin rest (2) and is able to generate and adjust an anteroposterior upwardly oblique thrust F on the chin of the user. The method for using the said tutor implies putting on and fitting the chin rest, then manually activating the means (8) engaged on the chin rest (1) so as to obtain, on the chin of the user, who keeps his/her mouth shut and head reclined forward, a desired anteroposterior upwardly oblique thrust F which, via the user's yaw, transmits to the atlas bone (first vertebra of rachis) an equal force R whose horizontal component Ro is cause for a retropositioning of the cervical curve, and whose vertical component Rw is cause for an upwardly directed stretching and, consequently, a direct straightening of the underlying dorsal curve.