No ringing, but with earplugs (the hearing protection kind) or airpods or anything else in my ears that seals tightly, in a quite environment I can hear a sort

No ringing, but with earplugs (the hearing protection kind) or airpods or anything else in my ears that seals tightly, in a quite environment I can hear a sort of rumble from clenched jaws if I listen very carefully. Probably the muscles vibrating a little or the bloodflow or something.