You may have seen the popular craze called "Mewing" online which incorporates some of the principles of OMT in therapy on yourself. This is named after and promoted by Dr. Mike Mew. He provides good information, but keep in mind that successful & safe therapy includes professional & individualized assessment, diagnosis, planning, implementation & evaluation.
Breath, James Nestor
Oxygen Advantage, Patrick McKeown
The Breathing Cure, Patrick McKeown
Anxiety Free, Patrick McKeown
Shut your mouth and save your life, George Catlin