the present invention provides a virtual orthodontic treatment method , comprising , providing a virtual diagnostic setup model of teeth of at least one jaw of an individual , associating virtual orthodontic appliances with all teeth in the model to obtain a first composite model and repositioning teeth into an initial treatment state according to pre - defined appliances - dependent rules ; in the initial treatment state , detaching one or more teeth from their corresponding one or more orthodontic appliances , repositioning one or more appliances , reassociating one or more appliances with the teeth , permitting the teeth to reposition according to the appliances - dependent rules to obtain an altered treatment state , yielding a better grade , according to one or more systems for grading an orthodontic model , as compared to the grade of initial treatment state .