What do you mean by plates?
Plates looke like this.Well,ã€€it's not exactly what I have, but thats the closest image I can get.
Thats the top part. You turn a notch it every week, and a gap makes the plate wider, so then your jaw gets more room for the teeth.
My jaw is too small, so the front teeth are a problem, and the canine teeth might be taken out