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Volume shows right away and settles in a week. Ultrasound data find about 80 % of lift still present at six months and roughly 60 % at 15. Chin and jawline—areas that move less—often keep shape longest; mouth-corner folds may want a nine-month top-up. Biopsies at three months show collagen up by 25 % near the gel, so firmness lingers even as HA fades. Smokers and heavy-sun clients may need eight-month boosters. If correction needs tweaking, 10 IU hyaluronidase per 0.1 ml melts Lyft quickly.