In this video, neurologist Dr. Sandra Black, Centre for Stroke Recovery Sunnybrook Site Leader, discusses the complex relationships between covert stroke (small strokes that cause no obvious symptoms), white matter disease, Alzheimer's Disease and dementia. Her conclusions are alarming: within a generation, if nothing is done, these diseases will result in an estimated 1.5 million cases of dementia. Caring for this population will cost a staggering $150 billion a year. Watch the video to learn more about this alarming trend, and what Canadians can do to head off the looming epidemic of dementia.