A computer-implemented system for use in creating a plan to reposition a patient's teeth from a set of initial positions to a set of final positions of the teeth, comprising: a means to receive a set of initial digital data which represent the teeth in the initial positions; a means to receive one or more restrictions related to repositioning of the teeth; and a means to generate treatment paths to move the teeth from the initial positions to the final positions in accordance with the restrictions and to resort to a database of preferred treatments of exemplary tooth arrangements.
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