Generally, most people who experience problems report such things as 'hearing loss' or/and 'ear fullness' or/and 'dizziness(vertigo)' or/and 'tinnitus' or/and 'headache(migraine)'.
In all cases, some process should be performed to rule out possible mechanical causes for above-mentioned symptoms such as middle ear effusion or/and Eustachian Tube Obstruction before all.
Ideally normal middle ear cavity pressure with balance between both ears.
This is the essential prerequisite.
If so, what is first, necessary and sufficient for it?
I cannot ever imagine Otolaryngology without the very method.
I wonder why I can never see anybody who concede and practice the very method except for one.
Such small one is for most.