It depends on the complexity of the individual case. Many straighforward treatments can be finished in 6 to 9 months. More difficult cases can take 12 to 18 months to complete. Keep in mind the aligners are very comfortable and virtually invisible to others. If you have any questions about Invisalign, or any other dental treatments in the Hershey PA area, please, don't hesitate to call the dental office ofWesley R. Davis DDS!