C.O.
M.:
You would be surprised at how fast teeth move.
We didn't have to get the second set of molds until 6 months later.
If she is gagging or vomiting - it sounds like she has a long uvula (the thing that hangs at the back of the throat) and they can do things to help with that so she won't vomit or gag.
Our molds were included in the price of the treatment so we didn't have to pay again. The molds also help when and if your daughter ever breaks or loses the retainers.