9 downloadable software for tracking use of orthodontic aligners, taking pictures of teeth to record and share progress of orthodontic treatment, and calendaring reminders to switch orthodontic aligners; downloadable software for collecting and tracking patient data, interacting with patients, scheduling appointments for orthodontic treatment and assessment, and providing treatment plans and information related to courses of orthodontic treatment; downloadable software for providing customized previews of results to be expected from orthodontic appliance treatment plans