A sound lip augmentation plan settles one question before it picks a product: do you want a temporary result or a permanent one. This article holds the options to that standard.
Fillers are one option, and a semi-permanent one
ASPS says lip fillers are only a semi-permanent solution. That single sentence is why filler cannot be the automatic answer. A reader who wants a lasting change and a reader who wants a reversible one are not asking for the same thing. For the research behind fillers, a meta-analysis of hyaluronic acid as a dermal filler for lip augmentation is on NCBI PMC.
The question that sorts the options
ASPS puts it this way: "The real question is, do you want a temporary or permanent solution to lip augmentation?" Everything else follows from the answer. OHSU's page on dermal fillers covers the filler side for readers who lean temporary.
Practices that meet the standard and shortcuts that do not
A practice that meets the standard asks the temporary-or-permanent question early and lets your answer shape what it proposes. The common shortcut is to offer filler without asking. That skips the question ASPS calls the real one, and it treats a semi-permanent product as if it were the only product. Cleveland Clinic's page on Sculptra, where it is injected, its results and risks shows how another injectable is described.
How to tell in the treatment room
In the room, notice who raises the choice. If the provider asks whether you want something temporary or something permanent, and explains what each answer leads to, the standard is being met. If a syringe is already in the plan, ask the question yourself. Cleveland Clinic's page on cheek filler, its benefits, risks and what to expect describes another filler treatment, which gives you something to compare against.