A lip filler simulator is good at one job. It helps you put a preference into words before a consultation. It is bad at most other jobs people hand it.
Start with a question, not a slider. Do you want a clearer upper-lip outline? More fullness? Or a smaller change than the examples you keep seeing? Write it down first. Otherwise you end up tweaking the preview for twenty minutes and learning nothing.
Use a clear, evenly lit, front-facing photo. Mouth relaxed. No beauty filter. Keep that one image as the original for every comparison. Don't use someone else's photo as your starting point. Read the service's consent, storage and deletion terms before uploading.
Check that the tool hasn't also changed your teeth, your expression or other parts of your face. If it has, throw that comparison out.
A single front photo can't show your side profile, a smile in motion, how your lips feel, or swelling and healing. The amount shown is a preview setting. It is not a dose. Per the FDA, results depend on tissue structure and the filler type and volume, which a photo can't assess.
What you bring to the appointment is the original, the preview you prefer, and one sentence on the difference. Something like "fuller in the centre, but I want to keep the dip in my upper lip." Say that the preview is AI-generated, and ask the provider which parts they would keep, change or advise against.
LookPrep's guide on how to use a lip filler simulator before a consultation has the full checklist and the questions to bring.
Sofia R., LookPrep