A system, method and/or computer readable medium may perform operations including receiving scan data of an actual condition of a patient's dental arch at a stage of an orthodontic treatment plan; making a comparison of the actual condition of the patient's dental arch as depicted in the scan data to a planned condition of the patient's dental arch for the stage of the orthodontic treatment plan; determining, based on a result of the comparison, that a planned final position for one or more teeth of the patient's dental arch will be difficult to achieve; determining a new final position for the one or more teeth of the patient's dental arch; and updating the orthodontic treatment plan to replace the planned final position for the one or more teeth of the patient's dental arch with the new final position for the one or more teeth of the patient's dental arch.