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Brushing your teeth with your non-dominant hand does something surprising to your brain. Before you scroll past thinking this is too simple, the neuroscience behind this habit is genuinely worth understanding. When you perform a routine task with your non-dominant hand, your brain is forced out of automatic pilot and has to recruit entirely new neural pathways to complete the action. That process, called neuroplasticity in action, literally builds new connections between neurons. The same kind of connections that dementia prevention research consistently points to as protective. Neurologists call this type of activity cognitive cross-training. It requires no equipment, no cost, and about 90 seconds of your day. The discomfort you feel doing it is not a sign you are doing it wrong. That discomfort is exactly the point. Your brain growing is supposed to feel a little strange. For caregivers watching a loved one's cognitive decline and feeling powerless to protect their own brain, this is one small, real thing within your control starting tonight. You cannot control everything. But you can control the next 90 seconds before bed. Try it tonight and report back in the comments. And save this for the next time someone asks how you are taking care of yourself.