Who pulled the wolf teeth?
I had my vet come out and do a full dentistry check up of my horses teeth and what he did was grind down the teeth with an electric grinder and checked the alignment, pulled the wolf teeth and rounded the front teeth that sit just behind where the bit sits.
He showed me and explained why.... They have a lot of soft tissue there and when you put a bit in and pull on the bit you’re shoving that soft tissue into those front teeth. So imagine you’re self getting your teeth cleaned by a hygienist and she pinches your lip between her tool and your teeth. Hurts right. Well I can tell you DANG it hurts...
My vet had to dope up my girls for him to do all this work and put a speculum in their mouth. The speculum locks open the mouth so he can get the grinding tool in the mouth and grind away (ouch)
He also hooks the speculum to a block and tackle to the top of the stall
First time I had to go through this and boy oh boy was I a wreck! I was so afraid of them falling and possible breaking there neck. I think the vet wanted to break my neck. I kept saying, hang on she's going down, she’s going down....
She never went down though.
Any ways, I know I'm long winded... Have your vet check the front teeth that sit behind the bit and if they are not rounded ask them to round them. Hopefully that will help your horse to be more comfortable with the bit. If your vet is up to date with this latest technology have him check the jaw alignment by moving the bottom jaw with the top jaw in a side to side motion. If they make a clicking sound that means there are teeth that are not ground down and they are interfering with each other. http://www.horsedentist.com/Bit%20Seats.htm
For your horses safety I would get a veterinarian to do this. There are a lot of people out that that title themselves and horse dentist, but they are not vetrinarians. This procedure dictates the horse to be sedated and the only person that I allow to sedate my horse is thier doctor!