I told my doctor about this effect of yawning and he said that’s just a reflex, unrelated. However my tinnitus started when they removed my wisdom teeth and that’s also when my TMJ started, so I’m pretty sure they are somehow related, and my tinnitus is generated by some kind of a bone/ligament alignment issue.

It’s very interesting what you said about ostheopathy, I would try it out except I’m afraid it can just as well make it worse as it can make it better if the ostheopath doesn’t know what they’re doing. At least that’s what dentists told me when I asked about if fixing my TMJ would fix my tinnitus.