Blog · May 5, 2026 · Dr. Fatima Mahdi, MD

Botox vs. Dermal Filler: A Physician's Guide to Choosing the Right Treatment

The One-Line Answer

Botox relaxes muscles. Filler adds volume. They are different tools for different problems, and often the best treatment plan uses both.

If you want the short version: read that line twice. The rest of this post explains how to tell which you need - and why getting this right matters.

What Botox Does

Botox (and its equivalents - Dysport, Nuceiva, Xeomin) is a purified form of botulinum toxin. A tiny amount injected into a targeted muscle temporarily blocks the nerve signals that tell the muscle to contract.

Result: The muscle relaxes. The skin over it stops creasing. Dynamic wrinkles - the ones that show up when you make expressions - soften or disappear.

Botox is ideal for:

Forehead lines from raising your brows
Frown lines ("11s") between the brows
Crow's feet at the outer eyes
Bunny lines on the nose
A lifted brow (relaxing the muscle that pulls it down)
Jaw slimming (masseter)
Lip flip
Gummy smile
Teeth grinding / TMJ
Excessive underarm sweating

Results: Visible at day 3-5, peak at day 14, last 3-4 months.

Cost: Priced per unit; smaller areas need fewer units, a full upper face more. You get an exact quote at your consultation.

What Filler Does

Dermal filler is a gel - most commonly hyaluronic acid (HA), a molecule your body produces naturally. Injected strategically, it replaces lost volume or enhances contours.

Result: Volume where you want it. Fuller cheeks. Defined jawline. Plumper lips. Smoother nasolabial folds.

Filler is ideal for:

Hollow cheeks / flat midface
Defined jawline or chin
Lip shape or volume
Tear-trough / under-eye hollows
Nasolabial folds ("parentheses")
Marionette lines
Hands (volume loss on the back of the hand)
Non-surgical rhinoplasty (advanced - not offered at every clinic)

Results: Most results visible immediately (swelling resolves by 2 weeks). Last 6-18 months depending on area and product.

Cost: Priced per 1 mL syringe; most areas need 1-2. You get an exact quote at your consultation.

How to Tell Which You Need

Here's the simple test:

1. Look in a mirror with a neutral face. Are the wrinkles you don't like still there when you're not making any expression?

Yes, they're still there: This is a volume/structural problem. Filler may help (or, for some deep static wrinkles, surgery).
No, they disappear when I relax my face: This is a dynamic/muscle problem. Botox will help.

2. Pinch the area gently. Can you "lift" or "fill out" the area by pushing the skin up or in?

Yes, pushing in adds volume that smooths it: You're seeing volume loss. Filler.
Nothing really changes with pinching, but the line does change when you move: Muscle. Botox.

3. Take a photo of yourself laughing vs. resting.

The line is only visible when laughing: Dynamic. Botox.
The line is just as visible resting: Static. Filler (or sometimes both).

"I have 11 lines that bother me."

These are almost always dynamic, visible when you frown. Botox. Typical: ~20 units to the glabella.

If the lines are so deep they're visible even at rest - "etched in" - we may combine Botox with a small amount of filler directly in the line. That's advanced and requires physician-level judgment on whether it's safe in that area.

"My cheeks look flat."

Volume problem. Filler. Typical: about 1 mL per side (~2 mL total).

Botox does nothing for flat cheeks.

"My lips feel thinner than they used to."

Volume. Lip filler (or possibly a lip flip for a gentler option), with conservative dosing often starting at 0.5 mL.

"I have forehead lines at rest."

Complicated. Usually a mix - dynamic component (Botox) plus skin laxity (not curable with injectables - at-home topicals, in-office lasers, or surgery). A consultation will help tease apart what's what.

"My jaw looks wide / boxy."

Could be masseter hypertrophy (large jaw muscle). Masseter Botox. Will also help if you grind your teeth.

If the jaw is actually heavy due to fat or bone structure, Botox won't help.

"My face looks tired."

This is the most common thing patients say - and often the hardest to address with one treatment.

Most "tired face" is a combination of:

Midface volume loss (cheeks flattening) → filler
Under-eye hollows or shadows → tear-trough filler (technically demanding - MD recommended) or possibly a different treatment (peels, lasers - which we don't offer)
Downturned mouth corners → a small amount of Botox to relax the depressor anguli oris

A good consultation will identify the actual contributors and prioritize.

"I want a more defined jawline."

Volume / contour. Filler (jawline), typically 2-4 mL.

When to Combine Botox AND Filler

Combining is common and often the best answer:

Lip flip + lip filler. Botox makes the upper lip roll out; filler adds volume. Together: enhanced shape without looking over-filled.
Full face rejuvenation. Botox for the upper third (forehead, glabella, crow's feet) + filler for midface (cheeks) and lower face (jawline, chin). Balanced.
Jaw slimming + chin filler. Masseter Botox narrows a wide jaw; chin filler lengthens a short chin. Together: balanced lower-face proportions.

We design combined plans one area at a time, not all at once on a first visit. We don't want to front-load too much change - we want to build results conservatively and evaluate.

What Neither Can Do

Injectables are powerful tools, but not unlimited:

Neither fixes sun damage. No injectable reverses pigmentation, texture issues, or thin, crepey skin. Those need different treatments (some of which we don't offer; we'll refer).
Neither fixes loose skin. Significant skin laxity is not an injectable problem. It's a surgical problem, or a tightening-device problem (RF microneedling, for instance - not offered here).
Neither changes bone structure. Filler can disguise some bone proportions, but it can't actually change your skull.
Neither is a weight-loss treatment. (Yes, people have asked.)

Honest clinics will tell you what they can't do. We don't treat wrinkles that aren't actually appropriate for Botox. We don't over-fill faces whose issue is something else. If Botox or filler isn't your answer, we'll say so.

Quick Reference Table

Question	Botox	Filler
What does it do?	Relaxes muscles	Adds volume
How long does it last?	3-4 months	6-18 months
When do I see results?	3-14 days	Immediately (final at 2 weeks)
Is it reversible?	No - wears off	Yes - dissolvable (HA)
Best for...	Dynamic wrinkles	Volume loss, contouring
Not good for...	Volume problems, loose skin	Movement-caused wrinkles
Pricing	Per unit, quoted at consultation	Per syringe, quoted at consultation
Downtime	None	3-7 days mild swelling

Ready to Talk?

Still not sure? That's what the consultation is for.

Book a consultation or call 613-869-3269

Learn more about Botox at Faces Aesthetics Alliston → Learn more about dermal fillers at Faces Aesthetics Alliston →

Dr. Fatima Mahdi, MD is a physician (CPSO #115421) and emergency physician. She practices medical aesthetics exclusively at Faces Aesthetics Alliston, 106 Victoria St W, 2nd Floor, Alliston, ON.