My face is on the narrow side and this is what I did. Place the mouthpiece over the mouth and hold it in place. Keep it tight to the face and keep your lips closed. Then gently puff out your cheeks. You should find that when you puff out your cheeks you reach a point where you have a good seal. If you then pull on the outer tube you will feel the suction OK which proves it. This worked for me immediately that I tried it.
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