Provided herein is system for repositioning teeth of a user in need thereof from an initial tooth arrangement to a final tooth arrangement, the user having a dental arch that comprises malpositioned teeth and normal-positioned teeth, the system comprising one or more cycles of successive appliances, each cycle of successive appliances including: (a) at least one first appliance having a geometry selected to reposition the teeth from the initial tooth arrangement to a first intermediate arrangement or the final tooth arrangement； (b) optionally one or more intermediate appliances having geometries selected to progressively reposition the teeth from the first intermediate arrangement to successive intermediate arrangements including a last intermediate tooth arrangement, each of the one or more intermediate appliances having at least one identical copy； and (c) at least one final appliance having a geometry selected to progressively reposition the teeth from the initial tooth arrangement or the last intermediate arrangement to the final tooth arrangement.
