Ideally, the lips are at their baseline when doing lip lift surgery, so that the procedure is tailored to the anatomy based on its true architecture. In other words you don't want filler distorting the true anatomy, because the entire procedure is being planned around the anatomy. That being said, whether or not the lip filler is dissolved in practice depends on how much filler you have, where it is, and the potential impact on the surgery. If there was so much filler that the anatomy was distorted, then yes, it would be good to dissolve it or wait until it wore off. However, if you just have a small or subtle amount in the lips themselves, it's unlikely to alter the surgeon's ability to design the lip lift. After surgery, there is not a rule about when filler can be placed, but there will be swelling after surgery, and it is a good idea to wait until that subsides. Often filler can be used to correct asymmetries that are present naturally in ones lips, and in this case it is even more important that the filler has worn off, so that the surgical planning can take into account the asymmetry.
