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A glass-skin sheen shows within a week as surface cells plump. Ultrasound at week 4 records a 0.2 mm dermal-thickness rise. After the three-visit course, 70 % of patients keep higher skin hydration at six months and 50 % at nine; necks and hands often stay improved to a year. Smokers or high-UV clients may need four-month refreshers, while low-stress lifestyles can stretch results beyond nine. Minimal swelling means what you see on day 1 matches the month-one look.