What potential issue does a single joint snaffle create?

A single joint snaffle can create a pinching effect on the horse's tongue and the bars of its mouth when pressure is applied. This occurs because the single joint creates a "nutcracker" action as the reins are pulled, which can lead to an uneven distribution of pressure. Such an effect can cause discomfort or pain for the horse, particularly if the bit is not properly adjusted or if the horse has a sensitive mouth. Ensuring that the bit fits well and is used correctly is crucial for the horse's comfort and performance.

In comparison, excessive pressure on the cheeks may not be a primary concern specifically associated with a single joint snaffle, as this bit generally doesn't apply pressure to the cheeks in the same way that other designs might. High severity leading to discomfort is not unique to single joint snaffles, as many factors contribute to the severity of any bit, including its type, fit, and the level of control exerted by the rider. Lastly, too much flexibility in the mouthpiece is not characteristic of a single joint snaffle; these bits are typically designed to be stable in the horse's mouth to provide consistent communication between horse and rider.