thanks for your online explanation for the expander. It was simple and uncomplicated. I noticed that the tool you used seemed much more user friendly than the one my child's orthodontist gave us. It's day 3 and I can't find the hole to put the key but also I think the tool is what I need to change. Ours is counter intuitive. Is the one you use a specific company? If so can you share the make of the tool. Many thanks.

good video Andrew really interesting.

Thanks for the video. It would be helpful if all views were from the front of the mouth, and not from the back, since that’s the only view any of us will have.