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A glossy bounce shows within 24 hours and settles by day 7. Ultrasound checks find about 70 % volume at six months and 45 % at nine. Lower lips, which move more, may need an eight-month polish; upper borders often keep their shape to month 12. Smoking and heavy sun speed breakdown; indoor habits slow it. If reversal is needed, standard-dose hyaluronidase melts the gel quickly.