It is difficult to say. First, there can be a very large number of reasons for changes in thinking that are not dementia and are temporary. Urinary tract or other infection, diabetes or other metabolic or other electrolyte imbalances, thyroid disesae, or practically any other disease. There can be things like that that cause the dementia to get worse temporarily also. But more often, it just is a bit worse for a few days and then goes back to before. There is not a way to reverse dementia. there ar ways to sedate someone so they are less prone to do things that cause problems. (tranquilizers like either valium or like anti-psychotics.