What is the purpose of hearing aid if a hearing impairment along with dementia?

A dementia patient: Still needs to be able to hear the world around them. We navigate through this world based on the evidence of our senses. Imagine you were not able to hear. How would people be able to assist you. How would you know if someone was warning you of danger. How would someone be able to tell you the date and time? One of the mainstays of working with patients is to keep them involved in today.