When you visit your dentist, they will take an imprint of your teeth, which is then used to personalise your Invisalign trays. The trays gradually straighten out your teeth in a slow but steady process.
Every few weeks or months, depending on your teeth, you will swap out your current tray for the next step. Since the trays are custom-made to fit your teeth, the trays progress you through the straightening process.
The Invisalign trays are worn most of the day, although you may take them out for meals. The longer you wear them, the faster you will progress through the stages.