I think it was KG in some sort of bit discussion when low palates came up in regards to bitting. Here's a pic of my horse's mouth with her mullen
mouth. Notice how the ridges remain in contact with the bit, even though her mouth is slightly open.
Looks painful, doesn't it?
For comparison, a "normal" palate:
Looks painful, doesn't it?
For comparison, a "normal" palate:
