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You see lift right away; the look settles over a week as the gel pulls in water. About 80 % of the volume remains at six months and 60 % at twelve. Jawlines and chins—areas that move less—can keep shape up to 15 months. Smokers or people in strong sun may need an 8-month top-up. Ultrasound at week 4 shows skin in the treated zone thickens by roughly 20 %, hinting at fresh collagen. If you ever need to reverse the filler, a quick shot of hyaluronidase dissolves it within minutes.