Horse Bit Basics A bit is a type of horse tack used in equestrian activities, usually made of metal and is placed in the mouth of a horse and assists a rider/lunger in communicating with the animal. It rests in the mouth in a region there are no teeth. It is held on a horse's head by means of a bridle and has reins/side reins attached for use by a rider or lunger. A bit functions through the principle of negative reinforcement: the reduction or relaxation of pressure as reinforcement for a behavior. The rider/lunger applies pressure through the reins to the bit in the horse's mouth and the horse is reinforced or rewarded for the correct response by softer contact or a release or pressure. Basic types There are hundreds of design variations, but the basics are defined by the way in which they use or do not use leverage. They include: • Direct pressure bits without leverage: o Snaffle bit: Uses a bit ring at the bit mouthpiece to apply direct pressure on the bars, tongue and corner of the mouth. • Leverage bits: o Curb bit: A bit that uses a type of lever called a shank that puts pressure not only on the mouth, but also on the poll and chin groove. A bit consists of two basic components, the bit mouthpiece that goes inside the horse's mouth, and the bit rings of a snaffle bit or shanks of a curb bit, to which the bridle and reins attach. The mouthpiece is the first factor most people think of when assessing the severity and action of the bit. Therefore, it is carefully considered when choosing a bit for a horse. Many mouthpieces are not allowed in certain competitions. Bit mouthpieces may be single jointed, double-jointed, "mullen" (a straight bar), or have an arched port in the center of varying height, with or without joints. Some have rollers, rings or small "keys" that the horse can move with its tongue. Mouthpieces may be smooth, wire-wrapped or otherwise roughened, or of twisted wire or metal. Various types of substances are used for bit mouthpieces, which may determine how much a horse salivates or otherwise tolerates a bit; a horse having a moist mouth is considered more relaxed and responsive. Commonly used metals include stainless steel and nickel alloys, which generally do not rust and have a neutral effect on salivation; sweet iron and copper, which generally tend to encourage salivation, and aluminum, which is considered drying and is discouraged as a mouthpiece metal. Synthetic mouthpieces may be made with or without internal metal cable or bar reinforcement. Rubber bits are generally thicker than metal bits, but other types of synthetics such as plastics are also used. Plastic-coated bits are often the same size as metal bits, and some are flavored. Effects Improper use of a bit can cause considerable pain to a horse The mouthpiece of the bit does not rest on the teeth of the horse, but rather rests on the gums or "bars" of the horse's mouth in an interdental space behind the front incisors and in front of the back molars. When a horse is said to "grab the bit in its teeth" they actually mean that the horse tenses its lips and mouth against the bit to avoid the rider's commands (although some horses may actually learn to get the bit between their molars) Depending on the style of bit, pressure can be brought to bear on the bars, tongue, and roof of the mouth, as well as the lips, chin groove and poll. Bits offer varying degrees of control and communication between rider and horse depending upon their design and on the skill of the rider. It is important that the style of bit is appropriate to the horse's needs and is fitted properly for it to function properly and be as comfortable as possible for the horse.[11] In the wrong hands even the mildest bit can hurt the horse. Conversely, a very severe bit, in the right hands, can transmit extremely subtle, nuanced signals that cause no pain to the horse. Commands should be given with only the quietest movements of the hands, and most steering is done with the legs and seat. Snaffle or direct pressure bits A direct pressure snaffle bit with single-jointed mouthpiece and stylized bit rings. All bits work with either direct pressure or leverage. Bits that act with direct pressure on the tongue and lips are in the general category of snaffle bits. Snaffle bits most commonly have a single jointed mouthpiece and act with a nutcracker effect on the bars, tongue and occasionally roof of the mouth. However, any bit that operates only on direct pressure is a "snaffle" bit, regardless of mouthpiece. Curb or leverage bits A western style curb bit. Bits that have shanks coming off the bit mouthpiece to create leverage that applies pressure to the poll, chin groove and mouth of the horse are in the category of curb bits. Most curb bit mouthpieces are solid without joints, ranging from a straight bar with a slight arch, Again, a bit with shanks and leverage is always a "curb" type bit, even when it has a jointed mouthpiece (which is more commonly seen on a snaffle). .