When singing, if the sound-resonance is sent a bit far back in the mouth, it can resonante in the head-skull, and if the jaws-mouth are wider than more longer-oval, the sound can easily reach the ears. This causes major problems for those with hyperacusis and tinnitus.
Solution– a better posture such that the sound is sent automatically more forward (more toward the teeth). Longer-oval shaped mouth also helps solve, but the better solution is through posture.
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