[Product Origin] China
[Product Advantages] There are screws on the expander. Turning the screw will expand the device, and this principle is used to expand the upper and lower dental arches.
The red part is a resin material commonly used in medicine. The device is fixed to the teeth through a rubber bracket and a steel wire.
There is a screw in the center of the device. When opening the device, you need to turn the screw key in the direction indicated by the arrow and then tighten the screw.