1st retainer: wear for 3 months day and night (all the time).
Retainers 3-4 are the retainers that you will wear at night forever. Each retainer should last a minimum of 6 months and up to a year. Please know that once all 4 retainers are no longer usable you will need to purchase more retainers to keep the smile you have worked so hard to achieve.
All 4 of the retainers are the same. You can use these trays for bleaching as well.
Good luck and if you have any questions don’t hesitate to call.