Jeffrey, Restricted breathing from bit pressure

Jeffrey, Restricted breathing from bit pressure 1
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Jeffrey, Restricted breathing from bit pressure 2
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From “Oral Biomechanics and Dental Equilibration in Equidae” By Dale Jeffrey, M/EqD

Jeffrey, Restricted breathing from bit pressure 3
Dale Jeffrey, M/EqD

Founder and President of Worldwide Academy of Equine Dentistry 

Glenns Ferry, Idaho