A mouth insert for treating nosebleeds includes a main body and a bite tab. The bite tab removably engages the main body and is configured to move up and/or down vertically in order to adjust the height of the device. The main body includes a horizontally extending elongated portion, a center portion extending downward from a bottom surface of the elongated portion, and the center portion has a narrower width than the horizontally extending elongated portion. The elongated portion of the main body is shaped and dimensioned to be inserted into a buccal cavity of a user's mouth and to fit behind the user's upper lip and in front of the user's upper gums, and the center portion is shaped and dimensioned to be positioned only in front of the user's upper front teeth. The bite tab includes a horizontally extending portion and a vertically extending portion and the vertically extending portion is configured to removably engage the center portion of the main body and the horizontally extending portion includes a push-surface used for pushing the device upward in order to provide pressure to the user's nose.