Dementia is a syndrome, not a disease. Dementia is a group of symptoms that affects mental cognitive tasks such as memory and reasoning. Dementia is an umbrella term that Alzheimer's disease can fall under. It can occur due to a variety of conditions, the most common of which is Alzheimer's disease
https://player.whooshkaa.com/shows/dementiaq
episode 45: Lemongrass Aromatherapy Alzheimers
There is no cure for Alzheimers disease, but symptoms may be reduced and quality of life may be improved for a time through any number of “complementary” therapies that are available.