Grey_Mafia65
LE
Was involved in a discussion about this the day, it would appear that current philosophy is for life or for as long as you want the teeth to remain straight!
She's got a wire and ?acrylic retainer for the top row (as there is still a slight gap they are trying to close up) - to be worn 24/7 and review in a couple of months; and a moulded ?rubber retainer for the bottom row - to be worn 12 hours a day for life.