Originally Posted by NaeNae87
Not sure what a roller mouth gag is but maybe this will help? I have added pics of the two types that I have mentioned.
True gag bits offer a "head raising" effect by working on the corners of the lips, accentuating the action of a normal snaffle. They can assist the rider with a horse that tends to travel with his nose to ground, but should only be used by a competent rider with independent seat and hands.
The Dutch Gag is a leverage bit, it's strength depending on the number of rings. Contrary to belief it's main effectiveness comes from pressure across the jaw rather than the poll.
Attachment 262210 Attachment 262202
A Dutch gag is NOT a leverage bit. It could only apply leverage if you used a curb chain/strap on it, which it is not designed to be used with. It adds poll pressure, not leverage.