Don’t be afraid of relapses. This brief a period of time (hopeless fully 3-4 days) will not lead to movement of teeth. Make sure that it’s the same clinic where you are getting the braces and crowns done. Your retainer will be made after crowns are placed. Retainer is removable appliance that you will have to wear continuously and remove while eating food. Other option is a fixed retainer that is stuck on your teeth from inside. If you have crowns, they will be uncomfortable in grinding your crowns. If the crowns are connected - i.e. a bridge, that’s good. But then you won’t be able to floss, which is bad. So it’s best to ask your dentist what he wants to do.

Hi,consult your orthodontist regarding the placement of retainer and then get the crowns fixed ASAP.

sir duration between dental braces and crown placement doesnt matter much. thankyou .hope we answered well to your questions