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Some women keep thick, full hair well into their 60s, and it's rarely genetics or luck. When estrogen drops during menopause, DHT can take over and gradually shrink hair follicles, which is why a widening part and thinning ponytail are so common at this stage. The good news: those follicles are usually dormant, not dead. Kiierr's DualWave laser cap uses medical-grade diodes to help wake them back up, FDA-cleared, six minutes a day. Learn more about what's actually happening at the follicle.