1. Gu, J et al. Evaluation of Invisalign treatment effectiveness and efficiency compared with conventional fixed appliances using the Peer Assessment Rating index. Am J Orthod Dentofacial Orthop February 2017, 151 259-66 Buschang, P et al Comparative time efficiency of aligner therapy and conventional edgewise braces. Angle Orthodontist, Vol 84, No 3, 2014.
2. Data on file at Align Technology, as of February, 2020. 
3. Compared to aligners made from single-layer .030inch (Ex30) material.
4. Compared to off-the-shelf, single-layer .030mm material.
5. Some doctors still take physical impressions using a soft putty. These impressions are then scanned by Invisalign technicians to create the 3D image for use in the ClinCheck® software and manufacturing aligners.
6. Data on file at Align Technology, as of November 7th, 2018.