Abstract: The invention concerns an orthodontic treatment using brackets bonded via their base onto each tooth of a dental arch, each bracket having a slot into which a first orthodontic arch wire is introduced so as to cause to move, the first orthodontic arch wire being held in slots of the brackets by ligatures, wherein the first orthodontic arch wire that remains in the mouth is introduced into the slots of the brackets; after the first orthodontic arch wire, a second orthodontic arch wire is placed on top; the ligatures are tightened so as to shape the ligatures and press the two arch wires against the bottom of the slots in the brackets, and once the ligatures have been tightened and shaped, the second provisional orthodontic arch wire is removed so as to obtain loose ligatures having a constant play with the first orthodontic arch wire.