A recap of this course from RDH Under One Roof 2023 Let’s jump into the facts surrounding hearing loss. Did you know that, according to the World Health Organization, by the year 2050 2.5 billion individuals might experience hearing loss?1 Currently, in the United States, about 48 million people are affected by varying degrees of hearing loss. This can occur in one or both ears and can range from mild to profound, affecting anyone regardless of age or background.