A patient came in last fall asking for "filler in the jawline" because she felt her face was sagging. When I assessed her in motion, what I actually saw was something different: heavy mentalis activity pulling her chin into a peau d'orange dimpling pattern at rest, depressor anguli oris muscles dragging the corners of her mouth into a permanent downturn, and masseter hypertrophy giving her lower face a square heaviness she read as jowl. She did not need filler. She needed three small neuromodulator placements in the lower face that, two weeks later, had her looking ten years younger without anyone being able to identify what had changed. That is the case that drives this article.
The lower face is the area where I see the most misdiagnosis in consultations. Patients see a sagging jawline, a downturned mouth, or a bulky jaw and reach for the explanation they have heard most: filler, thread lifts, or surgery. But a meaningful share of those presentations are not volume problems or skin laxity problems at all. They are muscle problems. And muscle problems answer beautifully to small doses of neuromodulator placed by someone who actually understands the anatomy.
The three muscles that change the lower face
When I evaluate the lower face, three muscle groups dominate the assessment: masseter, depressor anguli oris (DAO), and mentalis. Each one creates a recognizable presentation, and each one responds to a specific approach.
Masseter. This is the bulk muscle of the cheek-into-jaw transition. In patients who clench or grind — and there are a lot of them, particularly in high-stress professions and in anyone whose sleep architecture is poor — the masseter hypertrophies the same way any worked muscle does. The result is a wider lower face, sometimes a visible bulge along the mandibular angle, and frequently TMJ symptoms, headaches, and tooth wear that the patient may or may not connect to the face shape.
Depressor anguli oris (DAO). This is the muscle that runs from the lateral commissure of the mouth down toward the mandible. Its job is to pull the corners of the mouth down — useful for expressing displeasure, problematic when the muscle becomes dominant over the elevator muscles in the mid and late forties. The presentation is a permanent downturn at the corners that reads as sadness or anger even when the patient is at rest. Patients describe it as "looking unhappy when I am not."
Mentalis. This is the muscle of the chin pad. When it activates strongly, it pushes the chin upward and creates a dimpled, orange-peel texture in the chin skin. Many patients have an overactive mentalis that fires constantly at low level — when speaking, when concentrating, when listening — and over years this produces a chin pad that looks lumpy and irregular at rest, plus a deep mental crease (the horizontal line between lower lip and chin) that no skincare addresses.
Why I treat these together rather than separately
The lower face muscles do not operate in isolation. They work in opposition with the elevator muscles around the mouth (zygomaticus major and minor, levator labii) and against gravity at the mandibular border. When one group is overactive, the others compensate, and the resulting expression at rest reflects the net force.
If I treat only the DAO without addressing mentalis, the mouth corner lifts but the chin still puckers. If I treat only the masseter, the jawline narrows over four to six weeks but a downturned mouth still reads as the dominant feature. The result that actually changes how a patient looks in the mirror — and in their own photographs — comes from balancing the muscle pulls in concert.
The dose math also matters. Masseter requires substantial dosing per side because it is a large, thick muscle — typically 20 to 30 units per side for a first treatment, sometimes more. DAO requires much less — 2 to 4 units per side, placed superficially and with care to avoid the marginal mandibular branch of the facial nerve. Mentalis is a small muscle that wants 4 to 8 units total at a single midline-bordering placement. These are not interchangeable doses. A provider treating mentalis with masseter doses produces a flat lower lip; a provider treating masseter with mentalis doses produces no result at all.
What I look for in a lower face assessment
When someone sits down for neuromodulator treatments targeting the lower face, my assessment has a specific structure.
I start with the face at rest. I look at the position of the mouth corners relative to the lateral commissure, the symmetry of the jawline at the mandibular angle, the surface texture of the chin pad, and the depth of the mental crease. I note whether there is asymmetry — there almost always is, and it matters for dosing.
Then I assess in motion. I ask the patient to clench their teeth firmly while I palpate the masseter. A normal masseter is palpable but yielding; a hypertrophied masseter is rope-like and visibly bulges. I ask them to grimace, pulling the corners of the mouth down hard, to assess DAO. I ask them to push the chin pad up — most patients do this involuntarily when asked to "make a sad face" — to assess mentalis.
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I am also assessing what is not a muscle problem. Volume loss in the prejowl sulcus, mandibular border resorption, and skin laxity each produce presentations that overlap with muscle overactivity but require different interventions. Filler in the right place, or microneedling and resurfacing for skin quality, sometimes belongs in the plan alongside neuromodulator. Sometimes the answer is neuromodulator first, reassess at six weeks, and add dermal filler treatments only if the muscle correction did not fully address the concern.
How I dose, and why I dose conservatively
Lower face dosing is unforgiving. The marginal mandibular nerve runs along the inferior border of the mandible and is vulnerable to diffusion if the DAO injection is placed too deep or too medially. Mentalis dosed too aggressively or placed too laterally produces lower lip incompetence — patients drool when they drink, struggle with certain consonants, and look slack across the lower face. Masseter dosed in the wrong location can affect risorius or even the smile vector itself.
For all of these reasons, I underdose at the first session and rebook at two weeks for any necessary touch-up. This is more important in the lower face than anywhere else on the face. A first-treatment patient who is slightly under-corrected at two weeks is an easy fix. A first-treatment patient who is over-corrected has to live with a flattened smile or weak lower lip for three months while the product wears off.
The other dosing reality is that lower face neuromodulator effects build over a longer window than upper face. The forehead and glabella usually show full effect by ten to fourteen days. Masseter takes four to eight weeks for visible slimming because the muscle has to atrophy from disuse — the slim is not from the toxin, it is from the muscle losing volume because it cannot contract. I tell patients this explicitly so they do not expect a different jawline at the two-week follow-up.
Who is a good candidate, and who is not
Good candidates for lower face neuromodulator share a pattern: they have an identifiable muscle overactivity contributing to the presentation, they have realistic expectations about what the treatment will and will not change, and they have skin and bone structure that will support the result.
Less-good candidates include patients whose primary problem is volume loss or skin laxity rather than muscle overactivity (filler or skin treatments are the appropriate intervention, not neuromodulator), patients with significant pre-existing lower lip weakness, patients with a history of neuromuscular disease, and patients seeking a result that their mandibular bone structure simply will not produce.
I turn away a meaningful portion of consultations for lower face neuromodulator. The most common reason is that the patient has come in convinced masseter botox will give them a defined jawline they were never going to have based on their underlying bone structure. Reducing masseter bulk in a patient with a wide mandibular bone structure narrows the lower face slightly but does not produce the V-shape seen in marketing photos. That is an honest conversation to have at the consultation rather than a disappointment to manage at six weeks.
Where this fits with adjacent treatments
Lower face neuromodulator is rarely the entire plan. Many patients benefit from a coordinated approach that combines lower face neuromodulator with skin quality interventions like microneedling, an AquaFirme facial series, or an occasional VI Peel for tone and texture. Patients with significant volume loss may need dermal filler treatments in the prejowl or chin to address a structural component the muscle correction cannot reach. Patients with deeper photodamage sometimes benefit from a fractional CO2 laser treatment for surface quality.
For patients with overall facial deflation in addition to muscle issues, a vampire facial using PRP can support the skin quality side of the plan. None of these are required for every patient. The plan is built from what the assessment actually shows.
I also pay attention to whether the lower face presentation is being driven by something upstream. Bruxism severe enough to hypertrophy the masseter is often a symptom of poor sleep, stress, or an undertreated TMJ problem. Treating the masseter buys time but does not fix the cause. For patients in mid-life with cortisol patterns that suggest chronic stress activation, the broader hormone and sleep conversation belongs in the same visit.
How to actually move forward
The next step for lower face neuromodulator is a consultation, not a same-day treatment. I do not inject the lower face at first contact unless the case is unusually straightforward and the patient has done meaningful research already. The reason is that the assessment in motion takes time, the dose math depends on what I find, and the conversation about realistic outcomes is what determines whether the patient is satisfied at six weeks.
Book online for an aesthetics consultation at either Columbus or Warner Robins. Bring photographs of yourself from five and ten years ago — not for comparison purposes, but because they often show how your face used to behave at rest, which tells me something useful about which muscle pulls have shifted. Bring your top three concerns about the lower face in your own words. From there I can build a plan that fits your anatomy and your goals rather than applying a default protocol that fits no one specifically.
Medical disclaimer: This article is for educational purposes only and does not constitute medical advice. Individual clinical decisions should be made in consultation with a qualified healthcare provider following appropriate evaluation. References to specific treatments, dosing, or protocols are informational.
Travis spent 17+ years in high-acuity clinical medicine — emergency, cardiac ICU, and cath lab — before founding Revitalize. He is a Certified Platinum Biote hormone therapy provider, the published author of You're Not Broken — You're Unbalanced, and the founder of the Rebuild Metabolic Health Institute. His clinical writing reflects the same precision he brought to critical care: specific, honest, and built around what actually works.
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