I have always had issues naturally equalizing in an airplane on the way down and would always end up with muffled hearing that wouldn't resolve itself until the next day, no matter how much I chewed, swallowed, yawned, wiggled my jaw, etc. When I was little, I remember being told that doing what essentially was a valsalva maneuver could permanently damage your ears so I always avoided doing it. After learning to dive a couple years ago I've been equalizing through the descent and wish I would have started sooner.