If there is asymmetry, it moves in the direction it is easy to move. Asymmetric expansion will occur.
Even if you live without treatment, the lower jaw is distorted and you give strength every time your teeth touch, or if you have severe clenching or grinding especially at night, a lot of distorted force will cause the skull to become distorted.
If you apply force while undergoing orthodontic treatment, it will break faster. If the sphenoid-occipital cartilage joint is loosened using MARPE, there is a risk of very much distortion and extension to one side occurs. Easy to move even when maxillary extension is done with ALF (Advanced Lightwire Functional) or MARPE/MSE (Maxillary Skeletal Expander) that expands the upper jaw turns faster in the direction