That depends on the cause of the dementia. In Alzheimer's dementia regression is not possible. However, the progression of the disease can at least be slowed down by the treatment.
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It is different when dementia, e.g. caused by a stroke, an infection or a lack of nutrients - so if reparable damage to the brain tissue is the cause. Then, after treatment and resolution of the causative disease, a regression of dementia is possible.
Author:Dr. med. Jörg Zorn
Source: Alzheimer Research Initiative