Facial fillers are injectable gels or microspheres that restore lost volume, smooth wrinkles, and reshape facial contours. They work in two ways: physically filling space beneath the skin, and stimulating your body to produce new collagen over time. Most procedures take 15 to 45 minutes, require no general anesthesia, and cost an average of $715 per syringe for the most common type. Here’s what you need to know about how they work, what’s available, and what to expect.
How Fillers Work
As you age, your face loses fat, bone density, and collagen. This creates hollows under the eyes, deepening lines around the nose and mouth, and a less defined jawline. Fillers address this by adding volume directly under the skin, essentially replacing what time has taken away.
The immediate effect is physical: the gel occupies space and pushes skin outward, smoothing wrinkles and restoring fullness. Over the following weeks and months, certain fillers also trigger a secondary effect. The material acts as a scaffold that attracts fibroblasts (the cells responsible for making collagen), prompting your body to build new structural tissue around the injection site. This means results can actually improve after the initial appointment as your own collagen fills in.
Types of Facial Fillers
Hyaluronic Acid (HA) Fillers
Hyaluronic acid fillers are by far the most popular option. HA is a sugar molecule that occurs naturally in your skin, where it holds moisture and provides cushioning. In filler form, HA is chemically cross-linked to create a gel that holds its shape for months rather than breaking down in days. Major brand families include Juvederm (with products like Voluma and Volbella) and the Restylane line (including Defyne and Lyft), each formulated with different thicknesses for different areas of the face.
HA fillers have traditionally been marketed as lasting 3 to 12 months depending on the product and placement. However, MRI-based research has shown that cross-linked HA can persist in the mid-face far longer than expected, with detectable filler remaining up to 15 years after injection. This doesn’t mean results look the same for 15 years. The filler migrates and changes over time, which is one reason practitioners recommend periodic touch-ups rather than repeated large-volume treatments.
The biggest advantage of HA fillers is reversibility. An enzyme called hyaluronidase can dissolve them if results are uneven or if a complication arises. In a non-emergency situation, the dissolving process takes about 48 hours, though practitioners typically recommend waiting at least two weeks before re-treating to let swelling settle.
Calcium Hydroxylapatite (CaHA) Fillers
Sold under the brand name Radiesse, this filler contains tiny calcium-based microspheres (30% of the syringe) suspended in a smooth carrier gel (70%). The gel provides immediate volume, then gradually gets absorbed by your body. The microspheres left behind act as a framework that stimulates fibroblasts to produce collagen, elastin, and other structural proteins. Over several months, your own tissue essentially replaces the filler material. CaHA fillers are commonly used for deeper wrinkles, nasolabial folds, marionette lines, and jawline contouring. They cannot be dissolved with hyaluronidase.
Poly-L-Lactic Acid (PLLA) Fillers
Sculptra takes a completely different approach. It provides no immediate volume at all. Instead, PLLA microparticles trigger a controlled, low-level inflammatory response beneath the skin that promotes collagen production over the course of several months. Results build gradually, typically requiring two to three treatment sessions spaced weeks apart. Sculptra was originally FDA-approved in 2004 for restoring facial fat loss in HIV patients, and is now widely used for general facial volumization. Like CaHA fillers, PLLA cannot be dissolved.
Common Treatment Areas
Fillers can be placed in nearly any area of the face, but certain zones are especially popular:
- Cheeks: Restoring volume to flattened or hollowed cheeks is one of the most common uses. Filler placed deep along the cheekbone can also provide a subtle lift to the mid-face.
- Nasolabial folds: The lines running from the nose to the corners of the mouth deepen as cheek fat descends with age. Filler can soften these creases significantly.
- Lips: Lip augmentation averages $743 per treatment and can add volume, improve symmetry, or define the lip border.
- Tear troughs: The hollows under the eyes that create a tired appearance. This is a delicate area that requires an experienced injector.
- Jawline and chin: Filler along the jaw creates a sharper, more defined profile. Chin filler can improve projection and balance facial proportions.
- Temples: Hollowing at the temples is an early sign of volume loss. A single deposit of filler placed deep in the temple can restore a youthful convexity.
- Brow: Strategic placement along the orbital rim can subtly lift the tail of the eyebrow.
Fillers vs. Botox
Fillers and Botox address wrinkles through entirely different mechanisms, and they work best on different types of lines. Botox is a neurotoxin that temporarily blocks the chemical signal between nerves and muscles, relaxing the muscles responsible for expression lines like crow’s feet, forehead creases, and frown lines. Fillers physically add volume beneath the skin to smooth static wrinkles (the ones visible even when your face is at rest) and replace lost facial fullness.
The two are often used together. Some practitioners inject Botox first to relax muscles that pull downward on the face, then use fillers to restore volume. This combined approach tends to produce longer-lasting results and higher patient satisfaction than either treatment alone.
What the Procedure Feels Like
Most filler products now contain a small amount of lidocaine, a numbing agent, mixed directly into the gel. Your practitioner may also apply a topical numbing cream or use a local anesthetic before injecting. You’ll feel pressure and possibly a mild stinging sensation, but most people find it tolerable. The entire appointment, including numbing time, typically lasts under an hour.
Immediately afterward, expect some redness, swelling, tenderness, and possibly bruising at the injection sites. You may notice a tight or full sensation in the treated areas. These effects are normal and generally resolve within a few days to two weeks. Most people return to work or normal activities the same day.
Recovery and Aftercare
For the first 24 to 48 hours, apply cold compresses to reduce swelling, avoid strenuous exercise, skip makeup on the treated areas, and stay away from alcohol. Don’t touch, rub, or massage the injection sites unless your practitioner specifically tells you to. Avoid direct sun exposure, saunas, and hot showers during this window, as heat can increase swelling. Sleeping with your head slightly elevated for the first night or two also helps.
If you notice persistent lumps or asymmetry that hasn’t improved after two weeks, contact your practitioner. With HA fillers, minor irregularities can often be smoothed with massage or, if needed, a small amount of hyaluronidase to dissolve the problem area.
Risks and Complications
Common side effects like swelling, bruising, and redness are temporary and expected. Serious complications are rare but worth understanding. The most significant risk is vascular occlusion, where filler inadvertently blocks a blood vessel. This can cut off blood supply to skin or, in extremely rare cases, affect vision. A large study calculated the incidence of vascular events at roughly 1 in 6,600 treatments (0.015%). The risk is highest in areas with complex blood vessel networks, particularly around the nose, nasolabial folds, and the area between the eyebrows.
This is the primary reason injector expertise matters so much. A provider with detailed knowledge of facial anatomy can avoid high-risk vessels and recognize the early signs of a vascular event (blanching, unusual pain, skin color changes) in time to intervene. With HA fillers, hyaluronidase can be administered as an emergency treatment, with re-dosing possible every 15 to 20 minutes if needed.
Other potential complications include infection, filler migration over time, nodule formation, and allergic reactions, though these are uncommon with modern products.
Cost
The average cost per syringe is $715 for hyaluronic acid fillers and $901 for non-HA fillers like Radiesse or Sculptra, based on data from the American Society of Plastic Surgeons. Most people need one to three syringes per session depending on the treatment area and their goals. Lip treatments average $743. Biostimulatory fillers like Sculptra often require multiple sessions but may need less frequent maintenance once collagen production is established. Fillers are cosmetic procedures and not covered by insurance.