The bit thickness should be adapted to the anatomical conditions of the horse’s mouth. In cooperation with the University of Veterinary Medicine Hannover we have carried out a measurement of the oral cavities. It showed that the horse’s mouth cavity is smaller and flatter than before assumed. Also, no conclusion is possible from the size of a horse to the size of the mouth cavity. 

With the help of a horse dentist or the “2-finger test”  it is possible to find out how much space there is in the horse’s mouth. This is how you can also determine the required bit thickness: Place the index and middle fingers in the horse’s mouth at the (toothless) place where the bit lies. Push the tongue to the side and wait until the horse starts to chew and the incisors come together. If the distance between the upper and lower cheeks is small, you can feel pressure on both fingers. The recommended thickness is then 14 – 16 mm. If the distance between upper and lower jaw is greater, you will hardly feel any pressure on your fingers. The recommended thickness is then 16 – 18 mm. 

If a too thick bit is chosen, there is a risk that pressure is exerted on the sensitive palate. This can cause pressure points and injuries. In any case it is unpleasant for the horse and can lead to head bangs, opening of the mouth or pushing against the hand. 

But also a bit that is too thin is not ideal for many horses and riders. The pressure distribution is then more selectively. This makes it necessary to provide sensitive aids. 

There are innumerable bit models and forms available on the market. It is not so difficult to make a choice with a little basic knowledge about the most common bit styles. 

Thanks to Sprenger Pferdesport