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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
I've never seen one rear or flip because of a chain under the chin, but with many halters, the noseband is simply too long, and you end up with a short useless piece of chain under the jaw, or a pinched jaw. Besides, I usually need to stop forward progress, not backward, so the over the nose application is more logical.eople are crazy and times are strange. I used to care but, things have changed. I've never liked the chain under the chin. I do use one over the nose quite often. Pass the snap through the near side ring exiting toward the eye (between the nose piece and the cheek piece), not out the bottom towards the mouth.