Looking for a little advice. My 6 yo has become a little fractious lately. Great attitude from the ground, including at liberty. No issue saddling and he takes the bit without any prompting.  We’ve had a few changes at the barn and between that and weather I have not been riding/ training as often as usual (2-3 times per week vs 5). He has started resisting right turns (head down and pulling, tail twisting a bit). I’ll make going to the left more work and he’ll return back to the right for a bit and then the struggle begins again (slight rearing and protesting). He’ll also trot a few circles when asked but after a few will start to tighten up a bit and lope. I’ll bring him down before he gets too tight and things get a little interesting. Throughout this, I’ve noticed he is constantly working his mouth and I mean constantly.  He doesn’t have a foamy mouth, and I like to think I’m giving gentle cues, but his mouth doesn’t stop. The bit is a D-Ring snaffle with a full bridle. I’ve made a dental appointment and well-check but looking to see if anyone has any  other advice. I am going to take a video of the next ride to see where it starts to shift.