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Shape change is instant, settles in a week, and keeps about 80 % of its volume at 12 months and 60 % at 18 months on ultrasound checks. Low-motion zones like hip dips last longest; high-pressure sitting areas soften sooner. Smokers and high-impact athletes may book a 10 ml top-up at month 12. Because swelling stays under 10 %, your day-one silhouette matches the month-one look—no water-balloon shock. If you need to adjust, standard hyaluronidase melts the gel in hours.