The last few days my gelding has been refusing to take the bit. It wasn't that noticeable at first, then the next day just hard to get it in, and yesterday he wouldn't let me and I had my friend help. He has never had a problem with it before. I make sure not to hit his teeth, I clean the bit before every time I ride, and I had the vet check his teeth. I have been trying different bits on him, but my trainer checked and they all fit. Under saddle, he feels more relaxed in the bits im using now. And im not going stronger with the bit Im actually going lighter. Any suggestions? Thanks!