Once your customized aligners are ready to go, you'll need to wear them 20-22 hours a day. Then, all you've got to do is simply pop in a new set of aligners every two weeks. In general, treatment time is 12-18 months, but the length of the digital plan mapped out by your dentist depends on your specific goals and how much you wear your aligners. Each set of aligners will gently move your teeth into place and transform your smile.