Invisalign, as you may have seen online or on social media, is the world's most popular clear aligner treatment for straightening teeth. Over 15 million people worldwide have now been treated with the system which just goes to show the universal appeal of Align, the company behind Invisalign. The treatment itself was released in 2000 after a few Stanford University students came up with the concept and today, Align has grown into a huge corporation that also owns i Tero scanners and Exocad digital planning software.