Half the lift consultations in the filler-fatigue era start the same way: "I still have product in. Can we just go ahead?" The honest answer is no — and the reasons protect your result.
A lip lift is planned in millimetres against your real anatomy: true philtrum length, true vermilion height, true lip roll. Residual filler falsifies all three — the surgeon would be measuring a temporarily inflated lip and lifting against proportions that will change as the product fades. Excision amounts, closure tension and the predicted result all depend on seeing the actual lip.
Hyaluronic-acid fillers dissolve with hyaluronidase — an enzyme injection that breaks the product down within days. It's quick, widely available, occasionally needs a second pass for stubborn or migrated product, and can be done at home before you travel. (Non-HA fillers and permanent products are a different, longer conversation — declare exactly what you've had, and when, at assessment.)
Many discover, post-dissolve, that their "thin lip" was mostly a low lip — and post-lift, that the volume they'd been buying yearly isn't missed. Some still choose a little filler months after the lift settles, now layered on correct proportions, in smaller amounts, less often. Either ending is fine; both start with an honest, empty canvas.