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Volume shows at once, settles in a week, and keeps about 80 % at 12 months and 60 % at 24 months on ultrasound scans. Cheek and jaw sites often last longer than fat pads because they move less. Gentle stretch on fibroblasts adds a small collagen bonus, so a 0.3–0.5 ml top-up at month 18 is usually enough. Smokers or heavy sun fans may want a 12-month booster. Standard hyaluronidase melts Voluma quickly if needed.