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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.
Under the chin is better. Run chain end w/snap through one side of halter, run under chin, snap to other side of halter. Reverse it if you are on other side. He probably isn't accustom to wearing a chin strap so try not to jerk the chain as form of punishment. used to put it over the nose but the horse got loose once, you dont want to do that because there is a bone there and is very sensitive.