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Glow often shows in days. By week 4 ultrasound picks up about a 0.2 mm dermal-thickness gain. After three visits, 75 % of users keep higher moisture at six months and 55 % at nine; necks and hands can hold improvements up to a year. Smokers and heavy sun fans may need four-month refreshers. Minimal swelling means the day-one look mirrors the month-one result, and 5 IU hyaluronidase removes excess in minutes if ever needed.