According to the World Health Organization (WHO), some 1.1 billion teenagers and young adults are at risk of hearing loss due to the unsafe use of personal audio devices, including smartphones, and exposure to damaging levels of sound at noisy entertainment venues such as nightclubs, bars and sporting events. Hearing loss has potentially devastating consequences for physical and mental health, education and employment.Nearly 50% of teenagers and young adults aged 12-35 years are exposed to unsaf …