Covering the mouth for people with hearing problems is still a big barrier to understanding others.
 At least 5% of the world's people are hearing impaired, and lip reading and paying attention to facial expressions are very important in communicating with these people, even when using sign language.

Deafness is one of the most profound disabilities, deaf people can neither speak nor speak, so it is considered two disabilities, but because their appearance does not show any sign of disability, in the classification of needs, they are considered among the last disabled people and they think  They have fewer problems.🎭