To answer these questions, it is helpful to have a general understanding of how the muscles and bones work. To be able to see which direction the bones are moving in and to know wether or not the movement is correct. With this knowlege you will be able to bring out the best in your horse and lessen your chances of injury.
A question came to me after viewing the after shots of Buddy's teeth. If a horse had seen a dentist their entire life, would their teeth stay aligned as they age? Below is a comparison of two 15 year old quarter horses. Sister has had dentistry her entire life, and Buddy had his teeth done for the first time by a dentist at the age of 15.
The jaw opens and closes, moves left and right, and the lower jaw moves forward and back. In order for the horse to properly chew its food, the teeth need to be in alignment. Because the teeth are contiunually growing, they can grow out of balance. The teeth on the left can grow longer than the right (this usually means the horse chews on the right side of their mouth), or the teeth in the back of the mouth can grow longer than the front (this is called a wedge). Then the incisors (front teeth), as they grow, develop an over bite. Without the aid of a reputable equine dentist the teeth become a significant issue to the horse for both good body mechanics and good health. If you are figting with your horse and have never had their teeth looked at by a reputable equine dentist, then stop and at least have their mouth looked at. Chances are their teeth are a part of your horses resistance in softening to your aids.