The exact causes of dementia are not yet known. By type, alzheimer’s disease, which is also known as (senile) dementia of the alzheimer type, is caused by the aggregation of toxic protein in the brain, and stroke-induced cerebrovascular dementia accounts for 80-90% of all dementia cases, with hydrocephalus or infectious diseases accounting for the rest. Dementia, which is a degenerative disease that is characterized by the general impairment of cognitive functions caused by temporary or lasting brain damage, is a serious 21st century disease.