Answer :

The structure in the mouth that helps to equalize pressure is the Eustachian tube. The Eustachian tube is a narrow tube that connects the middle ear to the back of the nose and upper throat. Its main function is to regulate air pressure in the middle ear, allowing it to match the air pressure outside the body. Here's how the Eustachian tube works to equalize pressure: 1. When there is a difference in air pressure between the middle ear and the outside environment (e.g., during changes in altitude or when flying in an airplane), the Eustachian tube opens to allow air to flow in or out of the middle ear. 2. By equalizing the pressure on both sides of the eardrum, the Eustachian tube helps prevent discomfort, pain, or damage to the ear. In summary, the Eustachian tube plays a crucial role in maintaining proper air pressure in the middle ear, which is essential for normal hearing and overall ear health.