Making sure your horse's bit fits properly is an essential element of caring for their wellbeing. To work properly, the bit must fit correctly. Bits are can be either too small or too large. If your horse's bit is too big, it will travel back and forth in the horse's mouth, potentially damaging the horse's teeth. If this happens, your rein aids will be muddled and ineffectively delivered to your horse. A bit that is too tiny, on the other hand, might cause pinching and irritation, as well as your horse's inability to close their mouth properly.

Because every horse's mouth is different, you should take into account both the length and width of the mouth piece. You can use the size of your present bit as a guide while shopping for a new one if it fits well. How to measure your bit: 1) Place your bit on a smooth, even surface to accurately measure it.
2) Using a ruler or measuring tape, take a measurement along the bit's mouthpiece. Make sure you measure from one ring's inside to the other's inside.