When you give a student a correction in class you expect them to change their dancing based on your input. But what if a student continues to need the same correction over and over again? It may be that they just aren’t listening, but it could also be your delivery.
If you aren’t getting results with a correction, try phrasing it in a different way. Perhaps use more detail, or try a metaphor and see if that works. Since each student is an individual, what makes sense to one may totally confuse another.
Look for that “lightbulb moment” in their eyes. You can usually tell when you are getting through. If you don’t succeed with one explanation, just keep trying different ways. It’s a challenge that will help you grow as an instructor. After a while you’ll build up a bunch of different techniques for getting your ideas across.