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I just had an initial consultation at a TMJ specialist clinic at the University of Minnesota. During my evaluation, the specialist told me that 40-50 mm is how wide the average person (and "normal" jaw) can open. I, like other people with hypermobile joints, can open my mouth comfortably, without strain, to a solid 55 mm.

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14y ago
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Q: How wide can you open your mouth and keep it that wide?
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