Ok my boyfriend has a 5 yr ottb she is a resue. We love her to death and she has great ground manners but we have one issue and I need help I have tryed everything I know.. She runs thru the bit and throws her head with her nose high in the air and is hard to control. Now in the past two moths I have had her teeth done the chrio out to adjust her and a vet give her a clean bill of health and she gets no feed just good hay and nice green grass. I have tryed bit after bit.She is going to 60 days of refresher training oct her spot is paid for and waiting for her. But the trainer she will be going to suggested a myler 3 ring combo bit for us to use and work her in untill then. This bit is not cheap but that does not faze me I will do what I have to do just wondering if anyone has ever used one and they can give me a review exp with the problems I am haven. She is only used for trail rides.