This is my first youngster that I have ever had this problem with. She continuously nonstop plays with the bit. Her tongue is always over it. After you ride for a couple hours she settles down and leaves it alone. I ride her in a full cheek copper mouth snaffle. Also, She has a horrible habit of when I am mounting of pinning her ears and wrinkling her nose up like she is going to bite, but never follows threw with it. She doesnt walk off when I mount or turn. She stands there but she makes these horrible faces. I have gone back to the ground and started jumping up and down beside her and just laying over the saddle but the pinning ears and faces still go on. Any time I am around she wants attention and enjoys being worked with. However, she hates being rode in a round pen. If we are going to the left she has her head out to the right and vice versa. The whole time she has her tongue over the bit. I have heard of people using Myler bits to help solve this problem but I don't know of anybody that actually uses one. She's has been awesome to train but these are two problems that still persist and I am looking for any ideas of how to break her of these habits. I trail ride her about twice a month. We trailer out and go riding. When I mount her in strange places she still makes faces but not as bad and doesnt play with the bit as much. Im assuming this is because of all the new surroundings she is busy paying attention to everything else.