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Results follow two waves. Water uptake peaks around day 7, giving that quick glass-skin glow. Collagen rises between weeks 3 and 8, firming the dermis and sharpening light reflection. Ultrasound data from centralefillers.com shows dermal thickness up 0.35 mm at month 3 and still 0.18 mm above baseline at month 8. Heavy sun lovers, smokers, and outdoor athletes usually keep results closer to six months; low-stress skin can stretch them to nine. Maintenance: one booster every six to nine months, or sooner if capillary hydroporometry dips below 45 a.u. Because the HA is uncross-linked, any extra volume softens on its own within weeks. In a pinch, 5 IU hyaluronidase per 0.1 ml smooths things even faster.