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The normal chewing motion – in slow motion.

This horse has an injury to his head (a bullet) that affects the movement of the jaw and subsequently has caused an abnormal wear pattern of the incisors.

Muscle atrophy of the right masseter muscle (cheek) from trauma to the head and the destruction of the nerve to innervate this area. The right side is now scared and preventing the jaw from opening fully. This decreased jaw motion prevents this horse from chewing properly. Note the normal muscling of the left cheek while the right cheek muscle is gone leaving the flat jaw bone. Floating does not improve the chewing motion significantly.

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