My OTTB jumper gelding has recently started what I think is grinding his teeth while under saddle. It doesn't SOUND like playing with the bit, it sounds like that nails-on-a-chalkboard-God-awful noise. He is ridden in a flash noseband and a plain eggbutt snaffle. I mostly notice it on flatwork days and I can't figure out what to do with it and obviously it bothers me. My coach is out of the country at the moment, but what would you guys think? Could it be the flash? Stress? Pain? He is pretty supple and super soft in the mouth. I could stop him with a pinky. He is also VERY difficult to get impulsion out of. (typical OTTB, right?
) Thanks in advance!