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Overview
Place the mouthpiece in your mouth, between your teeth. Close your lips around it. Do not put your tongue inside the hole or block the vents in the back.
Review Date 1/22/2023
Updated by: Denis Hadjiliadis, MD, MHS, Paul F. Harron, Jr. Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.