Bits

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While there are literally hundreds of types of bit mouthpieces, bit rings and bit shanks, essentially there are really only two broad categories: direct pressure bits, broadly termed snaffle bits; and leverage bits, usually termed curbs.

Bits that act with direct pressure on the tongue and lips of the bit are in the general category of snaffle bits. Snaffle bits commonly have a single jointed mouthpiece and act with a nutcracker effect on the bars, tongue and occasionally roof of the mouth. However, regardless of mouthpiece, any bit that operates only on direct pressure is a "snaffle" bit.

Leverage bits have shanks coming off the mouthpiece to create leverage that applies pressure to the poll, chin groove and mouth of the horse are in the category of curb bits. Any bit with shanks that works off of leverage is a "curb" bit, regardless of whether the mouthpiece is solid or jointed.

Some combination or hybrid bits combine direct pressure and leverage, such as the Kimblewick or Kimberwicke, which adds slight leverage to a two-rein design that resembles a snaffle; and the four rein designs such as the single mouthpiece Pelham bit and the double bridle, which places a curb and a snaffle bit simultaneously in the horse's mouth.

In the wrong hands even the mildest bit can hurt the horse. Conversely, a very severe bit, in the right hands, can transmit subtle commands that cause no pain to the horse. Bit commands should be given with only the quietest movements of the hands, and much steering and stopping should be done with the legs and seat.

Hackamore and Bitless bridle

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A hackamore is a headgear that utilizes a heavy noseband of some sort, rather than a bit, most often used to train young horses or to go easy on an older horse's mouth. Hackamores are more often seen in western riding. Some related styles of headgear that control a horse with a noseband rather than a bit are known as bitless bridles.

The word "hackamore" is derived from the Spanish word jáquima. Hackamores are seen in western riding disciplines, as well as in endurance riding and English riding disciplines such as show jumping and the stadium phase of eventing. While the classic bosal-style hackamore is usually used to start young horses, other designs, such as various bitless bridles and the mechanical hackamore are often seen on mature horses with dental issues that make bit use painful, horses with certain training problems, and on horses with mouth or tongue injuries. Some riders also like to use them in the winter to avoid putting a frozen metal bit into a horse's mouth.

Like bitted bridles, noseband-based designs can be gentle or harsh, depending on the hands of the rider. It is a myth that a bit is cruel and a hackamore is gentler. The horse's face is very soft and sensitive with many nerve endings. Misuse of a hackamore can cause swelling on the nose, scraping on the nose and jawbone, and extreme misuse may cause damage to the bones and cartilage of the horse's head.