Lip botox: what it is and how it differs from filler
"Lip botox" (or "botox in the mouth") is the injection of a small amount of botulinum toxin into the orbicularis oris muscle, the muscle that surrounds the lips. By relaxing part of the movement, it can soften the fine lines above the lip or make the upper lip roll slightly outward and look more exposed, an effect known as a "lip flip". It does not add volume: that is the job of filler.
Confusion between the two is common, and patients often ask for "botox in the mouth" wanting a bigger lip. This page helps clarify the difference and explain the functional effects, which are the most important part of the conversation.
What is lip botox usually used for?
The most cited indications, at a general level:
- Vertical lines above the lip (the barcode lines, or lip lines), when they come mainly from movement.
- An upper lip that "disappears" when smiling, where the muscle rolls the lip inward.
- Complement to other treatments, such as lip filler or gummy smile treatment.
Toxin is also injected near the mouth for other concerns, such as corners that pull downward (in the depressor anguli oris muscle) or gummy smile, which has its own page at toxin for gummy smile. In everyday speech, all of this sometimes becomes "botox in the mouth", so it is worth asking the patient what the real concern is.
Lip botox or lip filler?
They are different procedures with different goals. The broad comparison between toxin and hyaluronic acid is in botox or hyaluronic acid; for the lip, the difference looks like this:
| Aspect | Lip botox | Lip filler |
|---|---|---|
| Product | Botulinum toxin | Hyaluronic acid |
| How it works | Relaxes part of the muscle around the mouth | Adds volume and defines the contour |
| Volume | Does not add | Adds, according to the planned ml |
| Effect on the lip | May leave the upper lip more exposed | Enlarges, hydrates, contours the vermilion |
| Lines above the lip | Softens those from movement | May soften marked ones, at the professional's discretion |
| Onset of effect | A few days | Immediate, with swelling in the first days |
| Usual duration | Short, often 2 to 3 months | Generally 6 to 12 months |
| Reversal | None; the effect is allowed to wear off | Can be broken down with hyaluronidase |
The ranges vary with the product, dose or volume, and the patient. Filler details are in lip filler.
What are the functional risks?
The orbicularis oris is the muscle for closing the lips, speaking, whistling, kissing and sucking. For that reason, even small doses can temporarily cause:
- Difficulty using a straw or drinking from a bottle.
- Difficulty whistling, blowing or playing a wind instrument.
- Slight change in the pronunciation of letters that use the lips, such as P, B and M.
- Liquid leaking from the corner of the mouth when drinking.
- Asymmetric smile or one that looks different from usual.
These effects are usually mild and pass as the effect fades. For some patients, however, they matter a lot.
General toxin effects, such as a small bruise and pain at the site, are in botox side effects.
How long does lip botox last?
It usually lasts less than in the forehead. The mouth is in motion all the time and the doses used in the area are small, precisely so as not to compromise function. Many patients notice the effect fading in 2 to 3 months. Toxin duration in other areas is in how long does botox last?.
Who is usually a good candidate?
Generally, people with lines above the lip that appear mainly with movement (dynamic wrinkles) or an upper lip that rolls in when smiling, and who accept the temporary functional effects. Those who want volume, or have deep lines even at rest, tend to benefit more from other options, alone or combined.
Where does Harmy come in?
Harmy simulates filler at the Lips point, with the volume in ml set in Plan: the more ml, the more noticeable the change. The app does not simulate toxin in the lip. In the consultation, the filler projection helps show exactly this difference: if the patient wants the volume that appears in the After, the way is filler, not lip botox. It is an illustrative simulation, not a promise of results.
Frequently asked questions
What is lip botox?
It is the injection of a small amount of botulinum toxin into the muscle around the mouth, to relax part of the movement. It can soften fine lines above the lip or leave the upper lip slightly more exposed, without adding volume.
Does botox in the mouth make the lip bigger?
It does not add volume. By relaxing the muscle, the upper lip may roll slightly outward and look more visible, but real volume increase comes from filler with hyaluronic acid.
Does botox in the mouth get in the way of speaking?
It can slightly change the pronunciation of some letters, the ability to whistle, use a straw or hold liquid in the mouth during the first days or weeks. That is why the dose is usually small and conservative.
How long does lip botox last?
Generally less than in the forehead, often 2 to 3 months, because the mouth moves all the time and the doses used are small. It varies with the product and the patient.
Harmy images are illustrative simulations generated by AI from the patient's photo to support the conversation between practitioner and patient. They are not a promise of results. Indication, technique, product and volume are solely the decision of the licensed practitioner. This content is for information only and does not replace a clinical assessment.