Mouth Corner Botox: Does It Lift Your Smile?

Look in the mirror with a neutral expression, and you might notice your mouth corners tilting slightly downward — a resting look that can read as tired or unhappy even when you're neither. Photos make it even more obvious. A quick search turns up "mouth corner Botox," sometimes labeled DAO Botox, along with the same question everyone lands on: does it actually lift your smile, or is that wishful thinking?

The short answer is that it doesn't pull your mouth corners up. What it does is ease off the downward pull that's dragging them there in the first place — and for a lot of people, that's enough to change how the whole resting face reads. In this article, we'll cover the muscle mechanics behind the treatment, what kind of change to realistically expect, when it needs backup from filler, and how long results tend to last.

What Is Corner-of-Mouth Botox?

Corner-of-mouth Botox is a small-dose injection aimed at the depressor anguli oris, or DAO for short — the muscle that runs from each corner of the mouth down toward the jawline. It's not a separate product from regular Botox; it's the same botulinum toxin, just placed in a very specific spot and in a much smaller amount than areas like the masseter (jaw) typically need.

A typical dose here runs about two to four units per side, compared with the 30 to 50 units per side that jaw-slimming Botox often uses. That gap isn't arbitrary — the muscles around your mouth are directly involved in speech and expression, so providers keep the dose conservative. Go too high, and you risk a smile that looks a little off, or speech that feels slightly harder to control.

How It Works: The Muscle Tug-of-War at Your Mouth Corners

Your mouth corners sit at the center of a small tug-of-war. Muscles like the zygomaticus major pull the corners up and out when you smile, while the DAO pulls them down toward the jaw. Which side wins day to day depends on habit and muscle tone as much as anything else. If your mouth corners tend to sit low at rest, it usually means the downward-pulling muscle has the upper hand.

Botox weakens that downward pull by relaxing the DAO. It doesn't add strength to the upward-pulling muscles — it just takes some of the resistance away, so the muscles that were already trying to lift the corners have less to fight against. The visual result is a mouth that settles into a flatter, softer line at rest, and corners that move more freely when you do smile.

“Lifted” vs. “Less Droopy”: Setting Realistic Expectations

This is where expectations tend to get out of step with what the treatment actually does. Botox doesn't hoist your mouth corners upward. What changes is that the downward pull loosens, so a resting expression that used to look faintly upset softens into something more neutral.

Smiling tends to feel a little more effortless too, since there's less resistance holding the corners back. That said, this isn't the kind of change that turns into a wider grin or corners that climb up near your cheekbones. Individual results vary, and the most natural outcome is usually a subtle one — the kind where you notice the difference in the mirror, but people around you just read it as looking a bit more rested.

When Botox Alone Isn't Enough

A downturned mouth corner isn't always just a muscle problem. As volume in the midface and jawline shifts with age, marionette lines — the creases that run from each mouth corner down toward the chin — can show up alongside the muscle pull. When that's the case, Botox on its own won't change the line itself, since the issue is volume loss rather than muscle tension.

That's why Botox and dermal filler are often paired here. Botox eases the downward pull while filler restores the volume that's gone missing along the crease. Used together, the combination tends to look more finished than either one alone — if you've tried just one and felt underwhelmed, the other half of the equation may be what was missing.

Timeline: How Long It Takes to Work and How Long It Lasts

Don't expect to see anything right after the injection — the effect isn't instant. Most people start noticing the muscle easing up somewhere between three and seven days later, as the toxin gradually takes hold. From there, results typically hold for four to six months, though that range shifts depending on the person.

If you use your mouth and facial muscles expressively — a lot of talking, a lot of animated expressions — the effect may fade a bit sooner than average. That's not a reason to book appointments more often out of habit; it's more useful to let your own pattern guide the timing of your next visit.

It's also common for first-timers to feel like "nothing happened," partly because the dose here is intentionally small, and partly because it's hard to judge your own resting expression from memory. Taking a photo in the same pose and lighting before treatment, and again a week or two after, makes the change much easier to see objectively. On the flip side, going in expecting a dramatic transformation can also lead to disappointment — the goal here is closer to "looks a bit more rested" than "looks like a different person."

Side Effects & Risks

Corner-of-mouth Botox is generally well tolerated at conservative doses, but like any injection, it comes with some trade-offs.

• Mild bruising or redness at the injection site: Common and usually settles within a few days.
• Slight asymmetry while the effect kicks in: Can happen as one side settles a little faster than the other; typically evens out within one to two weeks.
• A subtly different feeling when you talk or smile: Some people notice their mouth corner feels a little unfamiliar at first, especially in the first few days.

If too much is injected, or it spreads slightly beyond the target muscle, speech can feel a touch less crisp or a smile can look uneven. This is uncommon at the doses typically used here, and it isn't permanent, but it's exactly why an experienced injector working conservatively — starting low and adding more later if needed — matters more in this area than in larger muscle groups.

Contact your provider if you notice swelling that hasn't improved after two weeks, pain that keeps getting worse instead of better, or any difficulty swallowing or speaking clearly. That last one is rare with cosmetic doses in this area, but if it happens, seek medical care right away.

Is It Worth It? Who's a Good Candidate

Before booking a consultation, it helps to get clear on three things. First, pin down what's actually bothering you — is it the downturned look at rest, or something about how your smile itself feels? Botox tends to make the biggest difference for the resting-expression issue.

Second, check whether marionette lines are part of the picture. If there's a visible crease alongside the muscle pull, pairing Botox with filler is worth asking your provider about rather than expecting Botox alone to smooth it out.

Third, bring your provider more than a neutral face — let them watch you talk, smile, and relax, since dosing and placement depend on how your muscles move across all three. Cost for this treatment varies by clinic, provider experience, and how many units your muscles actually need, so it's worth asking for a personalized estimate rather than assuming a flat rate. "Start low and add more if needed" is the safer approach here, both for your budget and for how natural the result looks.

The Bottom Line

Mouth corner Botox doesn't lift your smile in the literal sense — it loosens the downward pull that's been dragging your resting expression into a tired or unhappy look. For a lot of people, that's a small change that reads as a noticeably softer, more rested face. If marionette lines are part of what's bothering you, filler is usually the piece that finishes the job.

Like any procedure, it comes with some trade-offs — mild bruising and a short adjustment period are part of the deal for most people. Ultimately, the choice of whether to try it, and whether to pair it with filler, depends on your own muscle pattern, your goals, and your budget.

If you're considering mouth corner Botox, a consultation is the best way to find out what fits you. BeautyStone is a dermatology clinic in Seoul's Hapjeong neighborhood — see current offers at /en/promotion.

Frequently Asked Questions

Q1. Does mouth corner Botox hurt, and is there any downtime?

The injections themselves are quick, with only a brief pinch at each spot, and most people don't need any downtime afterward. Mild redness or a small bruise at the injection site is the most common side effect, and it usually fades within a few days.

Q2. How soon will I see results, and how long do they last?

Most people start noticing the muscle easing up between three and seven days after treatment, with results settling in by around the two-week mark. From there, the effect typically lasts four to six months, though it can be shorter if you're very expressive with your mouth and facial muscles.

Q3. Will it make my speech or smile look unnatural?

At a conservative dose, no — most people notice their resting expression looks softer without any change to how they talk or smile. Speech or smile changes are more likely if too much is injected or it's placed imprecisely, which is why starting with a lower dose and adjusting later is the safer approach.

Q4. Do I need filler too, or can Botox make a difference on its own?

It depends on what's causing the downturned look. If it's mainly muscle pull, Botox alone can make a noticeable difference. If marionette lines or volume loss are part of the picture, filler is usually needed alongside Botox, since Botox doesn't fill in a crease that's already there.