The answer printed nearly everywhere is six to twelve months, which is true in roughly the way that "adults are between five and six feet tall" is true.
How long a syringe lasts depends on which product it was and where it went. Six of the products on this shelf come from Galderma and Merz: Restylane L and Defyne, Kysse and Contour, Lyft and Radiesse. Three prices, and the placement logic is what separates them. Two other hyaluronic acid products, Versa and Evolysse, are a separate conversation.
How long does Restylane Kysse last?
Generally somewhere between six months and a year in a lip, and lips sit at the short end of any filler's range because they never stop moving. An area that moves constantly metabolizes product faster than one that does not, which is why the same syringe in a cheek and in a lip does not produce the same number of months.
It also does not stop, it fades. There is no day on which a result ends. That matters for planning, because the useful moment to think about the next appointment is when roughly half of it has gone, not when all of it has.
Why does one part of a face get one product and a different one an inch away?
Because these products differ in how firm they are and how they behave when the face moves. A soft product in a place that needs support does not last. A firm product in a place that needs softness looks wrong the moment somebody smiles.
- Restylane L. A general-purpose gel with lidocaine in it. Moderate firmness, and generally used where softness matters more than support.
- Restylane Defyne. Built to flex. Generally where I go for a fold that creases deeply and moves a lot, because a stiff product in a moving area announces itself.
- Restylane Kysse. Generally where I start for lips. Soft, flexible, and formulated for a structure that is in motion most of the day.
- Restylane Contour. Made for the cheek, where a product has to hold a shape and still move with the face rather than sitting on top of it.
- Restylane Lyft. Firm, and made for support rather than softness. It is the wrong product for a lip.
- Radiesse. Not hyaluronic acid at all. It is calcium hydroxylapatite, which is why it is grouped with the collagen stimulators as much as with the fillers. It cannot be dissolved: hyaluronidase does nothing to it. That belongs in the conversation before it goes in rather than afterwards.
Does the more expensive one last longer?
Generally the firmer products placed in less mobile areas last longer, and those happen to be the more expensive lines, so the pattern exists and the reason for it is not the price. The price follows the product. It does not follow the recommendation.
That distinction is the entire reason your quote is fixed before you commit instead of assembled in the chair. When the number cannot move once it is given, the product chosen and the amount charged were plainly decided separately.
When is another syringe the wrong answer?
- Radiesse in a lip. Not a judgment call. It is not the right material for that tissue and I will not place it there.
- More product in one visit than is needed to see whether it worked. I start conservatively and add at a second appointment. Adding is straightforward. Taking something out is a treatment in its own right with its own swelling and its own recovery.
- Anything inside about four weeks of an event. Bruising and swelling keep their own schedule regardless of how the appointment went.
- A syringe when the answer is not volume. A few times a month a consultation about filler ends with me writing down a surgeon's name, or recommending nothing at all this year. Sorting skin from volume from structure is most of what the appointment is for.
How soon does any of this mean anything?
Two weeks, and the first few days are not a preview. Swelling around a mouth in particular can be substantial and is not the result. I will not book a correction before the two-week mark, which occasionally frustrates people at day four and very rarely at day fifteen.
Anyone who wants the longer version of how that first conversation is structured can read the consultation page.
One practical note for the durability question. A syringe fading is gradual, so the honest way to answer "how long did it last" is to write down the date it was placed and then the date it stopped doing anything useful, once. After two rounds that is a real number for one particular face, in one particular area, which is a far better guide than the range printed on any website, including this one.
Questions people ask about this
How many syringes does one area take?
Generally fewer than the internet suggests. I would rather start with one and add at a second appointment than take something out, because removing is a treatment in its own right with its own swelling.
Can the product be changed at the next appointment?
Yes, and it happens often. What was used, where it went, and how it behaved over the following year is the information that makes a change sensible rather than random.
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