en Dentistry Letter to the Editor Letter to the Editor <div style="text-align: justify;">Approximately 430 million people worldwide need treatment for their hearing loss, and 80% live in low- and middle-income countries. Because hard-of-hearing patients have difficulty receiving oral hygiene education, they are unable to communicate easily with dental personnel and are therefore at increased risk of developing oral diseases.</div> hearing, children, mouth, teeth 1 2 http://jpr.mazums.ac.ir/browse.php?a_code=A-10-1246-2&slc_lang=en&sid=1 Farnaz Monsef Esfahani monsef_f@yahoo.com 100319475328460013336 100319475328460013336 No Dental Implants Research Center, Avicenna Institute of Clinical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran. saba ebrahimi Ramezani mis.adabi@gmail.com 100319475328460013335 100319475328460013335 No Dental Implants Research Center, Avicenna Institute of Clinical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran. roya Najafi-Vosough roya.najafivosough@gmail.com 100319475328460013337 100319475328460013337 No Hearing Disorders Research Center, Avicenna Institute of Clinical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran. homa naderifar hnaderifar121@gmail.com 100319475328460013338 100319475328460013338 Yes Research Center for Health Sciences, Institute of Health Sciences and Technologies, Hamadan University of Medical Sciences, Hamadan, Iran.