Abstract: A device for simulating the effects of a conventional orthodontic appliance on a virtual model of a patient's dental arches, includes: a processor (1) presenting a processing unit, interface elements having at least one display unit; and at least one memory for storing: at least one virtual model of the arches, and for at least one conventional orthodontic technique, characteristics identifying at least one orthodontic appliance for implementing the technique, standard parameters of the positioning of the orthodontic appliance, and at least one standard activation thereof, a program executable by the processor allowing said virtual model to be accessed and displayed on the display unit, the program including navigation instruments for selecting the standard orthodontic technique, the relative standard appliance and the standard activation, the memory including one parameter describing characteristics of resistance to movement of teeth subjected to action of a conventional orthodontic appliance.