Invisalign is a type of orthodontic treatment that helps to straighten teeth without the use of the typical metal braces. Invisalign has quickly revolutionized the orthodontics world. Now patients have a different option besides the conventional metal braces. How long do you have to wear Invisalign braces? Invisalign aligners should be worn between 20 to 22 hours per day. Essentially, they should remain in your mouth as much as possible for the treatment to be effective. That being said, aligners can (and should) be temporarily removed when eating, brushing, and flossing.