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(Not the OP)

For those of us who are not overweight or don't have deviated septums (the usual culprits), we probably have underdeveloped lower jaws and recessed chins.

These collapse on the airway when we sleep on our backs. MMA (maxillo mandibular advancement I think) is a surgical way of moving your jaw bones forward.

I had this done in a clinic in Seoul, as my US insurance was crappy and wouldn't cover the peocedure.

It's an uncomfortable recovery process but there's been improvements.