A 10-second 'pinky test' may be able to predict and help ward off dementia, experts have revealed. It's well known that exercise, especially starting at an early age, can lower the risk of dementia, as it boosts blood flow to the brain and reduces harmful inflammation, preventing toxic plaques from killing off cells.Aerobic workouts like swimming and jogging, along with weightlifting and yoga, have all been shown to slash the odds of dementia.But across social media, influencers and experts believe warding off dementia starts with something as small as your pinkies. Dubbed 'pinky time,' the exercise involves holding both hands in front of you with your palms facing each other. From there, cross your middle finger over your index finger on each hand, like you're crossing your fingers for good luck. With your index and middle fingers interlaced, touch your ring fingers to your thumbs and then move your pinkies up and down for several seconds.In one TikTok video about the trick, wellness influencer Ana Lučić claimed that 'just seven to 10 seconds a day of this exercise can help protect against Alzheimer's and improve brain plasticity.' Lučić noted that if your pinky finger can move easily, it's 'a sign your brain is in great shape' because 'loss of fine motor control often mirrors cognitive decline.' A 10-second finger exercise may reveal your risk of dementia and even help prevent it, experts have revealed