Why Do the Corners of My Mouth Turn Down? DAO Botox® vs Filler for Lower Face Balance
Have you ever looked at a photo and thought you looked tired, unhappy, or serious even though you felt completely fine? Sometimes the reason is not your mood at all. The corners of the mouth can naturally pull downward because of muscle activity, changes in facial volume, aging, or a combination of all three.
At OpalGlow Medspa in Woodbridge, NJ, lower face concerns are evaluated based on what is actually causing the downturn. For some patients, a small amount of Botox® in the DAO muscle may help. For others, dermal filler may provide better structural support. And in some cases, combining both approaches creates the most balanced result.
What Causes the Corners of the Mouth to Turn Down?
Several muscles in the lower face pull in different directions. One of the most important is the depressor anguli oris, commonly called the DAO.
The DAO runs from the lower jaw toward the corner of the mouth. When it contracts, it pulls the mouth corner downward. In some people, this muscle is naturally stronger or more active, which can make the mouth appear downturned even when the face is completely relaxed.
Other factors can contribute to a downturned mouth:
Strong DAO muscle activity
Loss of support around the mouth with age
Marionette lines extending downward from the mouth corners
Chin or lower face volume loss
Skin laxity
Changes in facial fat and bone support over time
Natural facial anatomy
Because several different issues can create a similar appearance, treating every downturned mouth with the same injection would not make sense. The first step is determining whether the concern is mainly muscle, structure, volume, skin quality, or a combination.
What Is DAO Botox®?
DAO Botox® refers to strategically placing a small amount of botulinum toxin into the depressor anguli oris muscle. The goal is to temporarily reduce some of the downward pull at the corners of the mouth.
When the DAO is relaxed appropriately, the muscles that pull upward are no longer working against as much downward force. The result can be a softer, more neutral resting expression rather than a dramatic change to the smile.
How Do I Know If My DAO Muscle Is Causing the Problem?
A muscle driven downturn often becomes more noticeable when you intentionally pull the corners of your mouth downward or make a frowning expression. During a consultation, your provider may ask you to move your lower face so the DAO and surrounding muscles can be evaluated.
DAO treatment may be considered when:
The corners of your mouth pull downward
You feel that you look sad or serious when you are not
The downturn becomes stronger with facial movement
Your lip volume and lower face structure are otherwise relatively well supported
Muscle activity appears to be a major contributor to the concern
If the mouth corner is being pulled down mainly because of volume loss, a deep marionette fold, or lack of structural support, relaxing the DAO alone may not provide the improvement you are looking for.
What Can DAO Botox® Actually Improve?
DAO Botox® is best thought of as a muscle balancing treatment, not a filler or lifting procedure. It does not physically add volume beneath the mouth corner or erase a deep fold.
In the right patient, reducing DAO activity may soften the downward pull and allow the mouth corners to rest in a more neutral position. The change is usually subtle.
DAO Botox® may help with:
Downturned mouth corners caused by muscle activity
A resting expression that appears sad or tense
Excessive downward pull in the lower face
Lower face balancing as part of a broader treatment plan
It will not correct every marionette line, replace lost facial volume, tighten loose skin, or reshape the lower face on its own.
When Is Filler Better for Downturned Mouth Corners?
Dermal filler works differently because it adds physical support rather than changing muscle activity. Hyaluronic acid filler may be considered when the tissues around the mouth have lost volume or when deeper folds are contributing to the downturned appearance.
For example, a patient may have a relatively normal DAO muscle but significant loss of support around the corners of the mouth. In that situation, relaxing the muscle may do very little because the primary problem is structural.
Filler may be more appropriate when:
Marionette lines are present at rest
The area around the mouth looks hollow or unsupported
Volume loss is creating a shadow beneath the mouth corner
Lower-face aging has changed facial proportions
The concern remains even when the DAO is relaxed
What Are Marionette Lines?
Marionette lines are the folds that extend downward from the corners of the mouth toward the jawline. They are different from nasolabial folds, which run from the sides of the nose toward the mouth.
Marionette lines may become more noticeable because of volume loss, skin laxity, facial movement, or changes in the underlying support of the lower face. A strong DAO can make the area look even more downturned, but the muscle is rarely the only possible factor.
This distinction matters because Botox® treats muscle activity while filler treats structural support and volume. A consultation helps determine which component is contributing most.
Do You Need Botox®, Filler, or Both?
Sometimes the answer is both. If a patient has a strong DAO muscle and also has loss of support around the mouth, addressing only one part of the problem may leave the result incomplete.
A combined approach may involve using Botox® Cosmetic to reduce the downward muscle pull while strategically using hyaluronic acid filler to restore support where volume has been lost.
A simplified way to think about it:
Strong downward muscle pull → DAO Botox® may help
Deep fold or volume loss → filler may help
Muscle pull plus structural loss → combination treatment may be considered
Significant skin laxity → injectable treatment alone may not address the entire concern
The goal is not to fill every line or completely eliminate movement. It is to understand why the lower face looks the way it does and treat only what needs correction.
Will DAO Botox® Change My Smile?
This is one of the most important questions to discuss before treatment. The DAO sits close to several other muscles responsible for lower lip movement and facial expression.
Because the muscles of the lower face overlap closely, precise placement and conservative dosing are important. If botulinum toxin affects a neighboring muscle unintentionally, temporary asymmetry or changes in lower lip movement can occur.
This is why lower face Botox® should not be approached as simply injecting a few units into a standard location. Your anatomy, muscle strength, symmetry, and movement pattern should be assessed first.
Will DAO Botox® Make My Mouth Corners Look Lifted?
Patients sometimes expect DAO treatment to physically lift the mouth in the same way that surgery might. That is not the goal.
The expected change is generally more subtle: reducing downward muscle pull so the corners of the mouth may rest in a softer or more neutral position. Your natural anatomy still determines the overall shape of your lips and mouth.
For someone with significant volume loss or marionette folds, additional structural treatment may be needed to create a visible change.
How Long Does DAO Botox® Last?
Botulinum toxin treatments are temporary. How long DAO treatment lasts varies based on your muscle activity, metabolism, dose, and individual response.
A follow up visit allows your provider to evaluate the result after the treatment has had time to take effect and make sure your lower face movement remains balanced.
Because lower face muscles play an important role in expression, eating, speaking, and lip movement, the goal is usually conservative treatment rather than trying to eliminate DAO activity.
Can DAO Botox® Be Combined With Other Lower Face Treatments?
Yes. Lower face aging rarely happens in just one isolated spot, so DAO treatment may be only one piece of a broader facial balancing plan.
Depending on your anatomy, treatment may also involve:
Chin filler for projection and lower face balance
Jawline filler for additional structure
Marionette line filler when appropriate
Lip filler for lost volume or definition
Botox® Cosmetic for other muscle related concerns
SkinPen® microneedling for skin texture and collagen support
Hyperdiluted Radiesse® for selected skin quality and firmness concerns
Not everyone needs multiple treatments. Sometimes a very small adjustment to one area is enough. A good treatment plan should be based on what your face needs, not on trying to treat every available area.
Who Is a Good Candidate for DAO Botox®?
The best candidate is someone whose downturned mouth corners are at least partly caused by strong DAO activity and who understands that the expected improvement is subtle.
Patients whose concern is primarily caused by deep folds, significant volume loss, or skin laxity may benefit more from filler, collagen supporting treatments, or another approach.
Your medical history, prior botulinum toxin treatments, medications, facial movement, and treatment goals should all be reviewed before deciding whether lower face Botox® is appropriate.
Why Lower Face Assessment Matters?
The area around the mouth is one of the most dynamic parts of the face. You use these muscles constantly when speaking, eating, smiling, and expressing emotion.
That makes lower face treatment very different from simply smoothing a forehead line. The provider has to evaluate your face both at rest and during movement to determine which muscle or structural change is actually causing the concern.
At OpalGlow Medspa in Woodbridge, NJ, treatment planning focuses on maintaining natural movement and facial balance rather than trying to eliminate every line.
DAO Botox® vs Filler: Which One Is Right for You?
If the corners of your mouth turn downward, the answer is not automatically Botox® or filler. It depends on why they are turning down.
A strong DAO muscle may respond to carefully placed botulinum toxin. Loss of structural support may be better addressed with filler. Patients with both may benefit from a combination plan.
The most important step is identifying the cause before choosing the treatment.
Schedule your consultation at OpalGlow Medspa in Woodbridge, NJ to receive a personalized treatment plan tailored to your goals.
