This is not one of my current horses, but I tried out a TB for sale that has this problem. I understand why they could get this way - poor training, being rushed into the bit (esp. a TB broke for the track). However, my question is, can this habit be resolved? I looked in her mouth with a flashlight and didn't see any glaring hooks or problems, however I would have her floated ASAP if I were to buy her anyway. She's a nice mare but I don't want to take on a problem that has very little chance of resolving.