Dermal fillers: a patient's guide to what they are, what they do, and what to ask

Dermal fillers are one of the most popular aesthetic treatments — and one of the most misunderstood. If you're considering fillers for the first time, here's what you actually need to know before your consultation.

What fillers are and what they do

Dermal fillers are injectable substances that add volume, smooth wrinkles, and reshape facial contours. Unlike neuromodulators (Botox, Dysport), which work by relaxing muscles, fillers work by physically occupying space under the skin.

The most common category is hyaluronic acid (HA) fillers — brands include Juvéderm, Restylane, RHA, and Belotero. HA is naturally found in skin and joints. HA fillers can be partially or fully reversed using hyaluronidase, which is a meaningful safety advantage over non-HA fillers.

Other categories include:

• Calcium hydroxylapatite (Radiesse) — thicker, used for deeper structural work, lasts longer, not reversible
• Poly-L-lactic acid (Sculptra) — a biostimulator that gradually triggers collagen production; results appear over months and last 2+ years
• PMMA (Bellafill) — semi-permanent; rarely used for first-time patients

Common treatment areas

• Lips — adding volume and definition; one of the most requested but requires a conservative approach
• Nasolabial folds — the lines from nose to mouth
• Cheeks — restoring or adding structure and mid-face volume
• Under-eye hollows (tear troughs) — among the most technically demanding filler sites
• Jawline and chin — contouring the lower face
• Temples — hollowing that comes with aging

Duration: what to expect

HA filler duration varies by product and treatment area:

• Lips: 6–12 months (metabolized faster due to movement)
• Cheeks: 12–18 months
• Nasolabial folds: 9–18 months
• Structural products like Radiesse: 12–18+ months
• Sculptra: 2+ years (builds gradually)

Individual metabolism, lifestyle, and injector technique all affect how long results last. Anyone promising a specific number is guessing.

The injector matters more than the brand

A skilled injector with an off-brand HA product will produce better results than an unskilled one with the most premium syringe. What to look for in an injector:

• Board-certified or credentialed clinician (MD, NP, PA, RN with medical supervision)
• Experience specifically in facial anatomy and aesthetics
• Willingness to go conservative — "less is more" on a first visit
• Before/after photos relevant to your concern
• Clear conversation about realistic outcomes

Be cautious of high-volume, quick-turnaround practices where consultations are rushed.

Overfilled results: the "pillow face" problem

The most common complication in aesthetic medicine isn't bruising or swelling — it's too much filler over time. Patients often come back for top-ups without dissolving old product first, and the cumulative effect changes the natural structure of the face.

A good injector reviews your filler history, assesses whether prior product needs to be dissolved before adding more, and tells you when you don't need treatment. If a provider has never said "not yet" or "you're good," that's worth noticing.

What to ask at your consultation

• "Which product do you recommend for my concern, and why that specific product?"
• "Is this reversible if I don't like it?"
• "What's your approach to undercorrecting on a first visit?"
• "What do you do if there's a vascular complication?" (Any experienced injector will have a hyaluronidase protocol ready.)

A consultation that doesn't include time to answer those questions is a consultation that doesn't have your interest as the priority.

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