Lip filler and Botox are not the same thing. They are two completely different treatments made from different substances, and they work in different ways. Lip filler adds physical volume to your lips using a gel-like substance injected directly into the tissue. Botox is a muscle relaxant that can be used near the lips in a procedure called a “lip flip,” but it doesn’t add any actual volume.
How Lip Filler Works
Lip fillers are injectable gels, most commonly made from hyaluronic acid, a substance your body already produces naturally in skin and joints. A practitioner injects the gel directly into your lips to increase their size, shape, or symmetry. The filler sits beneath the skin’s surface and physically plumps the tissue, so results are visible immediately after the procedure.
Several FDA-approved hyaluronic acid fillers are used for lips, including products in the Juvéderm line (such as Volbella), the Restylane line (such as Restylane Kysse and Restylane Silk), Belotero Balance, and Revanesse Versa. These vary slightly in texture and firmness, which is why practitioners choose specific products depending on the look you’re going for.
Lip filler typically lasts 12 to 18 months before your body gradually breaks down the hyaluronic acid. If you don’t like the result, hyaluronic acid fillers can be dissolved with an enzyme injection, which is a safety advantage unique to this type of filler.
How the Botox “Lip Flip” Works
Botox can be used on the lips, but it works nothing like filler. In a procedure called a lip flip, a small amount of botulinum toxin (usually around 4 units) is injected along the border of the upper lip. This relaxes the muscle that circles your mouth, called the orbicularis oris. When that muscle relaxes, the upper lip rolls slightly outward, making it look a bit fuller without any added volume.
A lip flip is subtle. Research measuring the effect found that patients had a slightly taller upper lip and a shorter distance between the nose and lip border, but the overall increase in lip surface area wasn’t statistically significant. This is a good option if your upper lip tends to disappear when you smile or if you want a minor enhancement without committing to filler. It won’t give you dramatically bigger lips.
Results from a lip flip take 3 to 7 days to appear and peak at about two weeks. The effect lasts only 2 to 4 months, considerably shorter than filler.
Key Differences at a Glance
- What they do: Filler physically adds volume inside the lip. Botox relaxes the muscle so the lip flips outward slightly.
- Results timeline: Filler results are immediate. Botox takes up to two weeks to fully kick in.
- How long they last: Filler lasts 12 to 18 months. A Botox lip flip lasts 2 to 4 months.
- Best for: Filler is better for adding noticeable size or reshaping. A lip flip is better for a subtle enhancement, reducing a gummy smile, or testing the waters before committing to filler.
Side Effects for Each
Both treatments involve injections, so swelling, bruising, and tenderness at the injection site are common with either one. These typically resolve within a few days to a week.
The risks specific to each treatment reflect how they work. Because Botox relaxes muscles, a lip flip can temporarily affect lip function. Some people have trouble pronouncing certain words, drinking through a straw, whistling, or eating with a spoon for about a month. This makes it a poor choice for singers or anyone whose work depends heavily on precise lip movement.
Lip filler carries different risks. Because the gel is injected into tissue with blood vessels, there’s a rare but serious risk of vascular occlusion, where filler blocks a blood vessel. This is why choosing an experienced, qualified injector matters. The advantage of hyaluronic acid fillers is that they’re reversible: if something goes wrong or you simply don’t like the look, the filler can be dissolved.
Can You Get Both?
Some people do get both. A lip flip paired with filler can complement each other: the filler adds volume while the Botox keeps the upper lip from curling inward when you smile. If you’re unsure which you want, a lip flip is often a lower-commitment starting point. It’s less expensive, wears off faster, and gives you a preview of what a slightly fuller upper lip looks like before you invest in filler. If you like the direction but want more, filler is the next step.