How do you assess whether the bit is correct in the mouth. I had to change my driving bit to a liverpool instead of a rubber bit as the rubber one was only on loan to me. Cue he starts head tossing badly. I then looked in his mouth and the bit was very near his teeth. I also heard it clunk a couple of times. I pulled it up further into the mouth but it appeared to crease the mouth on the horse badly. So how do you assess how high in the mouth it should be. I have had problems with head tossing before with a liverpool in, which is why I changed it. Im wondering whether it is the bit he doesnt like, or whether its just because I havent set up correctly in the mouth. He is ridden a snaffle. But the liverpool is very straight which may not be comfortable.