Invisalign. The world’s leading clear aligner treatment. Go to invisalign.pl for more information. Since 1999, Invisalign clear aligners have been at the forefront of orthodontic innovation, helping Invisalign Providers to treat over 3 million patients worldwide and help achieve the desired clinical outcome. Invisalign follows the same biomechanical principles as traditional orthodontics, providing you with an advanced force system for tooth movements. ClinCheck® software, our 3D digital treatment planning software, delivers personalised treatment plans for you to see before treatment begins.