Ears open when flying - No pressure

My husband is a flight attendant and has given me the following tip: To keep the ears open and no pressure when flying and hurt not when starting or landing, you just have to leave your mouth a little open. Then nothing happens.

Through the open mouth, the pressure can escape there and just does not press on the Eustachian tube, which runs between the middle ear and nasopharynx. It has always helped me so far and I never had the pressure on my ears.

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