The Invisalign system has come a long way since its inception in 1997. It is the most widely recognized brand of clear aligners in production today. It is offered by orthodontists in more than 40 countries, and more than 2.5 million patients have used it for their orthodontic treatment, according to industry experts. The statistics may make you wonder what makes Invisalign unique and why so many people are opting to use the system over some other methods of teeth correction. The following is some information on what differentiates this system from other corrective systems and perhaps why people continue to flock to it.