If a line is visible when your face is completely still, filler is usually the right conversation. If it only appears when you frown, squint or lift your brows, botulinum toxin is usually the right conversation. That is the entire distinction in two sentences. Toxin relaxes the muscle that folds the skin. Filler replaces volume and structure the face has lost. They solve different problems, and plenty of faces have both problems at once, which is why the honest answer to “which one do I need” starts with looking at what your face does when it stops moving.
The still face and the moving face
Sit in front of a mirror with a neutral expression. Now frown, raise your brows, then smile hard. The lines that only show up during the second part are dynamic lines, created by repeated muscle contraction. The hollows, folds and shadows that sit there through both parts are static changes, driven by loss of fat, bone and collagen support rather than by movement.
Botulinum toxin works on the first group. It blocks the nerve signal to a specific muscle, so the muscle contracts less and the overlying skin creases less. Fillers work on the second group. They are implanted devices that add physical volume under the skin, which is why the American Academy of Dermatology describes them as restoring lost fullness rather than smoothing expression.
This is also why the two are often used together rather than as rivals. A global consensus panel on combined treatment describes the standard strategy as relaxing the upper face, restoring volume in the midface, and doing some of each in the lower face. A review of sequencing found the combination outperformed toxin alone for the forehead and frown complex.
What Botox is actually approved to treat
This is narrower than most people assume. The current FDA label for BOTOX Cosmetic covers temporary improvement in the appearance of four things in adults:
- Moderate to severe glabellar lines, the vertical frown lines between the brows
- Moderate to severe lateral canthal lines, commonly called crow’s feet
- Moderate to severe forehead lines
- Moderate to severe platysma bands, the vertical cords in the neck
That is the approved list. Masseter injections for jaw slimming, the lip flip, bunny lines on the nose, chin dimpling, downturned mouth corners, gummy smile and trapezius injections are all off-label uses. Off-label is legal, common and often reasonable in trained hands, but you deserve to be told which category your treatment falls into.
The label also notes that dosing more often than every three months has not been clinically evaluated. If someone offers to top you up every six weeks, that is a claim beyond the evidence.
What fillers are actually approved to treat
Approved uses cover moderate to severe facial wrinkles and folds such as nasolabial folds, augmentation of the lips, cheeks, chin and back of the hands, correction of acne scarring, and restoring facial fat loss in people with HIV. The FDA maintains the current list of approved products.
Here is the part that rarely makes it into a consultation. The FDA explicitly states that dermal fillers are not approved for injection into the glabella, the nose, the area around the eyes, the forehead or the neck. Tear trough filler and non-surgical rhinoplasty, two of the most requested treatments in aesthetics, sit in that unapproved group. Fillers are also not approved for breast or buttock augmentation, or for injection into bone, tendon, ligament or muscle.
That does not mean those treatments are wrong for you. It means the risk conversation should be more serious, not less, and the anatomy training of the injector matters most in exactly those zones.
The risk that deserves your attention
Most side effects from either treatment are minor and short lived: bruising, swelling, tenderness, small lumps, a headache after toxin.
The rare serious risk with filler is injection into or compression of a blood vessel, which cuts off blood supply to the tissue. The FDA lists the possible consequences as tissue death, vision problems including blindness, and stroke. A 2025 systematic review of filler-induced arterial ischemia identifies the glabella, nose, nasolabial folds and forehead as the highest risk areas, which is the same list the FDA has not approved. Hyaluronic acid fillers can be dissolved with hyaluronidase, and that review found delayed treatment was associated with slower or incomplete recovery. Speed matters, so your injector should keep hyaluronidase on site and you should be able to reach a human quickly after hours.
Botulinum toxin products carry a boxed warning, the FDA’s strongest, for spread of toxin effect beyond the injection site. Reported symptoms include swallowing and breathing difficulty and have appeared hours to weeks after injection. The warning stems largely from high therapeutic doses used in medical conditions, and consensus reviews of aesthetic use describe serious events at cosmetic doses as rare. It is still worth knowing before you sign a consent form.
Product source is its own risk. The FDA has warned about counterfeit Botox found in the United States after people were injected with product from unverified suppliers, with hospitalizations among the reported harms. Asking to see the sealed vial is not rude. It is basic.
Red flags that mean call, do not wait
Seek medical attention immediately, during or after either treatment, if you notice:
- Unusual or escalating pain out of proportion to the procedure
- Any change in vision
- Skin near the injection site turning white, gray, blue or mottled
- Difficulty swallowing, speaking or breathing, or new widespread muscle weakness
- Drooping of the eyelid or brow that keeps worsening
- Signs of stroke, including face drooping, one-sided weakness, sudden confusion or severe headache
Fever, spreading redness or a hot tender lump days to weeks later also needs review rather than reassurance.
Choosing well
The useful question is not which treatment is better. It is which change in your face you actually want to reverse, and whether the person injecting knows the vascular anatomy of the zone they are working in. Ask what is approved and what is off-label, what product is going in, how it can be reversed, and who you call at nine on a Saturday night.
Our approach is described on the aesthetics service page. If you are weighing toxin before lines have set in, preventative Botox covers what that phrase does and does not mean, and for skin quality rather than lines or volume, exosomes versus PRP is the closer comparison.
Medically reviewed by Krishna Borges, MSN, APRN, FNP-C. This article is for general education and is not a substitute for individual medical advice.