Treatments · 6 min read
Botox or Filler? Which Problem Is Which
They are not competing products. They solve different problems, and choosing the wrong one is the most common reason a result disappoints.
Patients often arrive having already decided which treatment they want, usually from something they read or a friend's recommendation. About half the time the choice does not match the problem. It is worth being able to tell the difference yourself, because it changes what you should ask for.
The distinction is simple. A neuromodulator (Botox, Dysport, Xeomin) relaxes a muscle so that it stops folding the skin above it. A dermal filler adds volume or structure where tissue has been lost. One stops a movement; the other replaces a substance. If your concern is caused by movement, filler will not fix it. If your concern is caused by loss, no amount of muscle relaxation will fix it.
The mirror test
You can categorise most concerns yourself in about thirty seconds.
Look in a mirror with your face completely relaxed. Do not smile, do not frown, do not raise your brows. Note what you can see.
Now make the expression that produces the line that bothers you. Frown, or lift your brows, or smile widely.
- The line appears only with the expression, and vanishes at rest. This is a dynamic line. It is a muscle problem, and a neuromodulator is the answer.
- The line is visible at rest and deepens with the expression. This is a static line, partly etched into the skin. A neuromodulator will stop it deepening further and will soften it over months, but the etched component needs skin treatments (microneedling, resurfacing) or, occasionally, a small amount of filler.
- It is visible at rest and does not change much with expression. This is structural. It is volume loss, descent or skin quality, and it is not a neuromodulator problem at all.
Area by area
| What bothers you | Usually | Why |
|---|---|---|
| Frown lines between the brows | Neuromodulator | Created almost entirely by muscle contraction |
| Horizontal forehead lines | Neuromodulator | Same, though dosing must respect brow position |
| Crow's feet when smiling | Neuromodulator | Muscle around the eye |
| Fine crepey lines under the eyes at rest | Skin treatment or PRP | Thin skin quality, not muscle or volume |
| Hollow, shadowed under-eyes | Filler or PRP, carefully | Volume loss, but a technically demanding area |
| Nose-to-mouth folds | Filler in the cheek, not the fold | Caused by loss of cheek support above |
| Thin or asymmetric lips | Filler | Volume and shape |
| Vertical lip lines (smoker's lines) | Both, plus skin treatment | Muscle, volume loss and sun damage combined |
| Downturned mouth corners | Neuromodulator, sometimes filler | A muscle pulls the corner down; support may also be lost |
| Softening jawline, early jowls | Filler or biostimulator | Structural loss along the jaw |
| Chin dimpling ("orange peel") | Neuromodulator | Overactive chin muscle |
| Wide or square jaw, clenching | Neuromodulator | Enlarged masseter muscle |
| Neck bands | Neuromodulator | Platysma muscle |
| Loose, sagging skin | Neither | Energy devices help modestly; significant laxity is surgical |
The most misunderstood area: the fold beside your mouth
The nasolabial fold is the line that runs from the side of the nose to the corner of the mouth, and it is the single most common request in aesthetic medicine. It is also the one where treating the obvious thing produces the worst result.
The fold is generally not the problem. It is the consequence. As the fat pads and bone of the midface lose volume with age, the cheek descends slightly, and the tissue has to fold somewhere. That somewhere is the nasolabial fold. Inject filler directly into the crease and you are supporting the bottom of a slope while ignoring the top: the area becomes heavier, the fold flattens only partly, and the face begins to look full in the lower third and hollow in the upper. This is a recognisable look, and it is a large part of why people say they can always spot filler.
Restoring volume in the cheek instead lifts the tissue that was gathering, and the fold softens as a side effect. Less product, better proportion, and nothing that reads as treated.
Why the answer is often both
For patients past their early forties, the honest answer is usually a combination, in a particular order.
Consider a common presentation: forehead lines visible at rest, flattening cheeks, and folds beside the mouth. Treating only the forehead leaves the structural loss untouched and the face still reads tired. Treating only with filler leaves the muscle continuing to crease the skin every day, undoing the work. The sequence that tends to work is to relax the muscles that are actively creasing the skin, restore the structural support that has been lost, and then improve the quality of the skin itself so it reflects light evenly. Each part does something the others cannot.
The corollary is that a plan built around a single product is usually a plan built around what the clinic offers rather than what the face needs.
What this means for your consultation
You do not need to arrive knowing which treatment you want. It is more useful to arrive knowing what bothers you, and when. "I look angry in photographs even when I am not" is far more useful than "I want Botox," because the first tells a physician what to solve and the second constrains the solution before the problem has been examined.
A good consultation should end with you understanding which category your concern falls into and why, including the parts that will not respond to what you asked about. If nobody explains the reasoning, you are being sold a product rather than treated for a problem.
Common questions
What is the difference between Botox and filler?
Botox and other neuromodulators relax the muscle that creases the skin, so they treat lines caused by expression. Filler adds volume or structure where tissue has been lost, so it treats hollows, thin lips and lines present at rest. One stops a movement, the other replaces a substance.
How do I know if I need Botox or filler?
Relax your face completely and look in the mirror. If the line only appears when you make an expression, it is a muscle problem and a neuromodulator is the answer. If it is visible at rest and does not change much with expression, it is volume or skin quality, and filler or a skin treatment is the answer.
Should I get filler in my nasolabial folds?
Usually not directly. The fold is generally caused by loss of cheek support above it, so restoring volume in the cheek softens the fold with less product and better proportion. Filling the crease itself tends to make the lower face look heavy.
Can I have Botox and filler at the same appointment?
Often yes, and for many patients a combination gives the most natural result because the two treat different causes. Dr. Mazzuca will plan the sequence and the amounts at your consultation.
Which lasts longer, Botox or filler?
Neuromodulator results typically last three to four months. Hyaluronic acid fillers last roughly six to eighteen months depending on the product and area, and collagen biostimulators such as Sculptra can last around two years.
Dr. Mazzuca is a licensed physician practising medical aesthetics in Markham, Ontario, with additional training in cosmetic medicine, facial anatomy, women's health, and longevity medicine. Every treatment at the clinic is performed by her personally. Her registration can be verified through the College of Physicians and Surgeons of Ontario.
Written and medically reviewed by Dr. Monique Mazzuca, MD, CCFP. Published September 8, 2026.
This article is general information, not medical advice, and it is not a substitute for an in-person assessment. Results vary between patients, and every treatment carries risks that are reviewed with you before you consent. Suitability is determined by Dr. Mazzuca at your consultation.
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