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Expect a “glass-skin” glow about a week after the first session, thanks to instant HA hydration. Deeper changes roll in later: fibroblasts peak around day 14, and ultrasound shows thicker, denser dermis by week 8. A three-visit course keeps skin plump and smooth for six to nine months. Boost every six months to stay ahead, especially for smokers or city dwellers dealing with extra oxidative stress. One study showed dermal thickness up 0.3–0.4 mm at three months, still 0.18 mm above baseline at nine months. Because the HA is uncross-linked, long-term benefit depends on the new collagen you keep making—skip boosters and skin gradually slides back toward baseline within a year. Over-correction is rare and fades on its own; hyaluronidase is rarely, if ever, needed.