When you first begin wearing your SureSmile clear aligners, they will likely feel a bit tight. This is because they will start applying gentle pressure and working to straighten your teeth right away. When you switch to a new set of aligners, they will also likely feel tight for a couple of days as well. Should the discomfort of wearing a new aligner last for more than a week, please let our team know so we can ensure that your aligners fit properly.