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Contours show instantly, then settle by day 7 as the gel draws water. Ultrasound data report 78 % volume left at six months and 55 % at one year. Chin and jawline hang on longer than mouth corners because enzymes work slower there. Elastography even picks up a 0.25 mm dermal-thickness boost at month 3—your fibroblasts respond to the gentle stretch. Most clients need a 0.3–0.5 ml refresher around month 10; high-metabolism athletes aim for eight months. If you must reverse, 10 IU hyaluronidase per 0.1 ml melts the gel in minutes.