How do retainers work?
It is recommended that you wear your last set of aligners as your retainer for 22 hours/day.
From there your doctor recommends you begin to gradually reduce your retainer wear over time: 2 weeks at 18 hours per day, 2 weeks at 12-14 hours/day, and then ultimately wearing your retainer for 8 hours/day indefinitely.
This wear schedule will allow your teeth to heal and stabilize in their new position! This retainer should last for 6-12 months, with proper care and cleaning.