Originally Posted by gypsygirl
^^ how can it help you from catching the horse is the mouth ??
When I say 'snag' its in the context of the mouth being torn. This can happen if for some reason the riders hands get forced too high upwards and instead of the bit acting on the bars (gums) it will be forced against the corners of the mouth which can tear surprisingly easily. This is also how some horse literally get the 'bit between their teeth' and allows them to bolt.
If all horses were properly trained to go forwards between the hand and leg then there would be no need for most gadgets but that still wouldn't stop the unforseen happening and a well fitted martingale is not going to interfere with the horses natural outline or restrict safe movement of the head when its needed.