Two treatments, nearly identical names, endlessly confused in comments sections. The honest sorting, once and for all:
A few units of botulinum toxin into the upper lip's orbicularis muscle, relaxing it so the lip rolls slightly outward when at rest and especially when smiling. No incision, minutes to do, days to appear — and honestly modest: it shows a little more vermilion without adding volume or changing the philtrum at all. It lasts roughly 6–10 weeks (lip muscles metabolise toxin fast), and at higher doses can subtly weaken sipping, whistling and certain consonants — the trade for the roll.
Surgery: a measured strip of skin removed at the nasal base, permanently shortening a long philtrum, everting your own vermilion and restoring tooth show. Local anaesthesia, 45–90 minutes, one scar in the nose's shadow line, one recovery — and no renewal, ever.
Measure your philtrum (the self-test article shows how). Around 11–15 mm: your options live in the flip/filler aisle. Pushing 16–18 mm and beyond, with vanished tooth show: you have a structural situation, and eight-week solutions will only ever be eight-week solutions. Photos plus your number gets you the specific answer — including, sometimes, "you don't need any of it."