What is Invisalign and how does It work? A lot of people want a straight, perfect smile, but they worry about how metal braces will change their appearance. Fortunately, modern orthodontic techniques have made it possible to straighten your teeth without having to get a mouthful of metal. Clear aligners are an increasingly popular orthodontic method for improving tooth alignment. Keep reading to learn everything you need to know about how the Invisalign system works.