What Are Dermal Fillers?
Dermal fillers are injectable gel-like substances placed beneath the skin to restore lost volume, smooth wrinkles and creases, soften facial folds, enhance facial contours, and improve overall facial symmetry. They are the second most popular non-surgical cosmetic procedure in the United States (after Botox), with over 3.4 million treatments performed annually.
Most dermal fillers are made of hyaluronic acid (HA), a naturally occurring sugar molecule found in skin, joints, and connective tissue. Your skin already contains HA — it's responsible for keeping skin plump, hydrated, and youthful. As we age, we lose approximately 1% of our HA per year, along with collagen, elastin, and fat volume. Fillers replace what time takes away.
Fillers vs Botox — what's the difference? Botox relaxes muscles that cause wrinkles (crow's feet, frown lines, forehead lines). Fillers add volume to fill in wrinkles, folds, and hollows. Botox treats
dynamic wrinkles (caused by muscle movement). Fillers treat
static wrinkles and volume loss (visible at rest). Many patients use both for comprehensive facial rejuvenation — a combination often called a "liquid facelift."
Types of Dermal Fillers
Not all fillers are created equal. Different filler types use different active ingredients, each with unique properties that make them better suited for specific treatment goals:
Hyaluronic Acid (HA)
Most Popular — 90%+ of fillers
Naturally occurring sugar molecule that binds water to create volume. Smooth, gel-like consistency. Results are immediate and reversible with hyaluronidase.
Brands: Juvederm, Restylane, RHA, Belotero, Versa
Duration: 6-24 months
Reversible: Yes
Best for: Lips, cheeks, jawline, under eyes, nasolabial folds
Calcium Hydroxylapatite (CaHA)
Volume + Collagen Stimulation
Mineral compound found naturally in bone. Provides immediate volume plus long-term collagen stimulation. Thicker and more structured than HA fillers.
Brand: Radiesse
Duration: 12-18 months
Reversible: No
Best for: Cheeks, jawline, hands, nasolabial folds
Poly-L-Lactic Acid (PLLA)
Collagen Biostimulator
Biodegradable synthetic polymer that stimulates your body's own collagen production over time. Results are gradual, not immediate. Read our full Sculptra guide »
Brand: Sculptra
Duration: 2-5 years
Reversible: No
Best for: Temples, cheeks, full face rejuvenation, body
Polymethylmethacrylate (PMMA)
Semi-Permanent
Tiny PMMA microspheres suspended in collagen gel. Creates a permanent scaffold under the skin. Only filler type considered permanent. Used very selectively.
Brand: Bellafill
Duration: 5+ years (permanent)
Reversible: No
Best for: Nasolabial folds, acne scarring
Why HA fillers dominate the market: Over 90% of all filler treatments use hyaluronic acid products. The reason is safety — HA fillers are the only type that can be completely dissolved if there's a complication or the patient is unhappy with results. This reversibility gives both patients and injectors a critical safety net. For first-time filler patients, HA fillers are almost always recommended.
Filler Brands & Products
Each filler brand offers a family of products designed for different treatment areas and needs. Here are the major filler families available in the US:
Juvederm Family (Allergan/AbbVie) — Vycross & Hylacross Technology
Juvederm Voluma XC
Best for: Cheeks, chin, jawline
Duration: Up to 2 years
Consistency: Firm, high lift
Juvederm Vollure XC
Best for: Nasolabial folds, marionette lines
Duration: Up to 18 months
Consistency: Medium, flexible
Juvederm Ultra XC
Best for: Lips (volume), nasolabial folds
Duration: Up to 12 months
Consistency: Medium, smooth
Juvederm Volbella XC
Best for: Lips (subtle), perioral lines
Duration: Up to 12 months
Consistency: Soft, fine
Restylane Family (Galderma) — NASHA & OBT Technology
Restylane Lyft
Best for: Cheeks, midface, hands
Duration: Up to 18 months
Consistency: Firm, lifting
Restylane Contour
Best for: Cheeks, midface (flexible lift)
Duration: Up to 12 months
Consistency: Medium, dynamic
Restylane Defyne
Best for: Nasolabial folds, marionettes, chin
Duration: Up to 18 months
Consistency: Medium, flexible
Restylane Kysse
Best for: Lips (natural movement)
Duration: Up to 12 months
Consistency: Soft, expressive
Restylane Silk
Best for: Lips (subtle), perioral lines
Duration: Up to 6 months
Consistency: Ultra-fine
Restylane (Original)
Best for: Nasolabial folds, general wrinkles
Duration: Up to 12 months
Consistency: Medium
RHA Collection (Revance) — Dynamic HA Technology
RHA 2
Best for: Perioral lines, lips, fine wrinkles
Duration: Up to 15 months
Consistency: Soft, dynamic
RHA 3
Best for: Nasolabial folds, marionettes
Duration: Up to 15 months
Consistency: Medium, dynamic
RHA 4
Best for: Cheeks, jawline (dynamic areas)
Duration: Up to 15 months
Consistency: Firm, dynamic
Other Notable Fillers
Radiesse (Merz)
Type: CaHA
Best for: Cheeks, jawline, hands
Duration: 12-18 months
Bonus: Stimulates collagen
Belotero Balance (Merz)
Type: HA
Best for: Fine lines, delicate areas
Duration: Up to 6 months
Unique: Integrates smoothly into skin
Revanesse Versa (Prollenium)
Type: HA
Best for: Nasolabial folds, lips
Duration: Up to 12 months
Advantage: Less swelling than competitors
Bellafill (Suneva)
Type: PMMA
Best for: Nasolabial folds, acne scars
Duration: 5+ years (permanent)
Note: Requires skin test first
Brand Comparison Table
Choosing between filler brands can be confusing. This table compares the most commonly used products by treatment area:
| Treatment Area |
Best Juvederm |
Best Restylane |
Best RHA |
Other |
| Cheeks | Voluma XC | Lyft / Contour | RHA 4 | Radiesse |
| Jawline | Voluma XC | Defyne / Lyft | RHA 4 | Radiesse |
| Chin | Voluma XC | Defyne | RHA 3-4 | Radiesse |
| Nasolabial Folds | Vollure XC | Defyne / Original | RHA 3 | Bellafill, Versa |
| Marionette Lines | Vollure XC | Defyne | RHA 3 | Versa |
| Lips (Volume) | Ultra XC | Kysse | RHA 2-3 | Versa |
| Lips (Subtle) | Volbella XC | Silk / Kysse | RHA 2 | Belotero |
| Under Eyes | Volbella XC | Silk | RHA 2 | Belotero |
| Temples | Voluma XC | Lyft | RHA 4 | Sculptra |
| Hands | — | Lyft (FDA) | — | Radiesse (FDA) |
| Fine Lines | Volbella XC | Silk | RHA 2 | Belotero |
Most injectors are multi-brand experts. The best results often come from using different products in different areas during the same session — for example, Voluma in the cheeks for structure, Vollure in the nasolabial folds for flexibility, and Volbella in the lips for softness. Don't fixate on one brand; trust your injector's product selection.
Treatment Areas
Dermal fillers can be used across multiple facial areas, each requiring different products, volumes, and techniques. Here are the most popular treatment areas:
Cheeks & Midface
Goal: Restore volume, lift, contour
Syringes: 2-4 (1-2 per side)
Cost: $1,200-$3,600
Duration: 12-24 months
Top fillers: Voluma, Lyft, RHA 4
Jawline
Goal: Define, sharpen, contour
Syringes: 3-6
Cost: $1,500-$4,800
Duration: 12-18 months
Top fillers: Voluma, Defyne, Radiesse
Chin
Goal: Project, lengthen, balance profile
Syringes: 1-2
Cost: $600-$1,800
Duration: 12-18 months
Top fillers: Voluma, Defyne, Radiesse
Nasolabial Folds
Goal: Smooth smile lines
Syringes: 1-2
Cost: $600-$1,800
Duration: 9-18 months
Top fillers: Vollure, Defyne, RHA 3
Under Eyes / Tear Troughs
Goal: Fill hollows, reduce dark circles
Syringes: 1-2 (0.5-1 per side)
Cost: $600-$1,500
Duration: 12-18 months
Top fillers: Volbella, Belotero, Silk
Lips
Goal: Volume, shape, symmetry
Syringes: 1-2
Cost: $500-$1,200
Duration: 6-12 months
Top fillers: Ultra XC, Kysse, RHA 2
Temples
Goal: Restore hollowing, widen upper face
Syringes: 2-4 (1-2 per side)
Cost: $1,200-$3,600
Duration: 12-24 months
Top fillers: Voluma, Lyft, Sculptra
Marionette Lines
Goal: Lift mouth corners, reduce "sad" look
Syringes: 1-2
Cost: $600-$1,800
Duration: 9-18 months
Top fillers: Vollure, Defyne, RHA 3
Hands
Goal: Restore volume, hide veins/tendons
Syringes: 2-4 (1-2 per hand)
Cost: $1,200-$3,000
Duration: 12-18 months
Top fillers: Restylane Lyft, Radiesse (both FDA-approved)
How Many Syringes Do I Need?
One of the most common questions. The number of syringes depends on the treatment area, desired result, and whether this is your first treatment or a maintenance visit:
| Treatment Area |
First Treatment |
Maintenance |
Cost Range |
| Lips | 1-2 syringes | 0.5-1 syringe | $500-$1,200 |
| Nasolabial folds | 1-2 syringes | 0.5-1 syringe | $600-$1,800 |
| Marionette lines | 1-2 syringes | 0.5-1 syringe | $600-$1,800 |
| Cheeks (per side) | 1-2 syringes | 0.5-1 syringe | $1,200-$3,600 total |
| Chin | 1-2 syringes | 0.5-1 syringe | $600-$1,800 |
| Jawline | 3-6 syringes | 1-3 syringes | $1,500-$4,800 |
| Under eyes (per side) | 0.5-1 syringe | 0.3-0.5 syringe | $600-$1,500 total |
| Temples (per side) | 1-2 syringes | 0.5-1 syringe | $1,200-$3,600 total |
| Hands (per hand) | 1-2 syringes | 0.5-1 syringe | $1,200-$3,000 total |
| Full face rejuvenation | 6-12+ syringes | 3-6 syringes | $4,000-$10,000+ |
The "less is more" approach: Experienced injectors recommend starting conservatively — especially for first-time patients. You can always add more filler at a follow-up appointment (usually 2-4 weeks later), but you can't take away overfilling. The trend in modern aesthetics has moved away from "pillow face" toward natural, balanced enhancement. A skilled injector will consider your overall facial proportions, not just the area you're asking about.
The Treatment Process
Here's what to expect during a typical dermal filler appointment:
Consultation (15-30 min)
Your injector evaluates your facial structure, discusses your goals, recommends specific products and volumes, takes photos, and reviews medical history and contraindications. This may happen on the same day as treatment or as a separate visit.
Numbing (15-20 min)
Topical numbing cream (typically lidocaine-based) is applied to the treatment areas. For lip and lower face treatments, a dental block (injection of local anesthetic) may be offered for more complete numbing. Most fillers also contain built-in lidocaine.
Cleansing & Marking
The treatment area is cleansed with antiseptic. Your injector may mark key injection points, reference lines, and areas of concern with a surgical marker.
Injection (15-45 min)
Filler is injected using a needle or cannula (a blunt-tipped flexible tube). The injector places product in precise amounts at specific depths, periodically pausing to mold and assess symmetry. You may feel pressure, mild stinging, or a dull ache. Multiple areas can be treated in one session.
Assessment & Touch-Up
Your injector reviews the results in a mirror with you, checks symmetry from multiple angles, and makes any final adjustments. Photos are taken for your medical record. Ice may be applied to reduce swelling.
Aftercare Review
You receive written aftercare instructions and are typically scheduled for a 2-week follow-up to assess results once swelling has fully resolved. Touch-up injections can be done at the follow-up if needed.
Needle vs cannula: Some injectors use traditional needles while others prefer cannulas (blunt-tipped tubes). Cannulas typically cause less bruising and are considered safer in certain areas (under eyes, cheeks) because they push past blood vessels rather than piercing them. The best injectors are proficient with both and choose based on the treatment area.
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How Long Do Fillers Last?
Filler longevity varies significantly by product type, treatment area, and individual factors. Here's a comprehensive breakdown:
| Product |
Type |
Duration |
Best Areas |
| Juvederm Ultra XC | HA | 6-12 months | Lips, nasolabial folds |
| Juvederm Volbella XC | HA | 6-12 months | Lips (subtle), perioral lines, under eyes |
| Restylane Kysse | HA | 6-12 months | Lips |
| Restylane Silk | HA | 6 months | Fine lines, lips |
| Belotero Balance | HA | 6 months | Fine lines, delicate areas |
| Juvederm Vollure XC | HA | 12-18 months | Nasolabial folds, marionettes |
| Restylane Defyne | HA | 12-18 months | Nasolabial folds, chin |
| RHA 2, 3, 4 | HA | Up to 15 months | Dynamic areas (various) |
| Revanesse Versa | HA | Up to 12 months | Nasolabial folds, lips |
| Juvederm Voluma XC | HA | Up to 24 months | Cheeks, chin, jawline, temples |
| Restylane Lyft | HA | Up to 18 months | Cheeks, hands |
| Radiesse | CaHA | 12-18 months | Cheeks, jawline, hands |
| Sculptra | PLLA | 2-5 years | Temples, cheeks, full face, body |
| Bellafill | PMMA | 5+ years (permanent) | Nasolabial folds, acne scars |
What Affects How Long Fillers Last
- Treatment area: High-movement areas (lips, mouth) break down filler faster than low-movement areas (cheeks, temples).
- Metabolism: People with faster metabolisms tend to break down filler more quickly. Active lifestyles and high cardio exercise can accelerate breakdown.
- Product type: More heavily cross-linked HA fillers (Voluma, Lyft) last longer than softer formulations (Silk, Belotero).
- Volume injected: Larger volumes in a well-supported area tend to last longer than minimal amounts.
- Injection depth: Filler placed deeper (subcutaneous, supraperiosteal) tends to last longer than superficial placement.
- Smoking: Significantly accelerates filler breakdown and reduces results quality.
- Sun exposure: UV damage degrades hyaluronic acid and reduces filler longevity.
How Much Do Dermal Fillers Cost?
Dermal filler pricing is typically quoted per syringe (each syringe contains 1 mL of product). Here's a detailed cost breakdown by product and area:
Cost Per Syringe by Brand
| Product |
Cost Per Syringe |
Loyalty Program |
| Juvederm family | $600-$1,200 | Alle (formerly Brilliant Distinctions) |
| Restylane family | $500-$1,000 | ASPIRE Galderma Rewards |
| RHA Collection | $650-$1,100 | RHA Rewards |
| Radiesse | $700-$1,200 | Merz Aesthetics rewards |
| Belotero Balance | $400-$800 | Merz Aesthetics rewards |
| Revanesse Versa | $400-$700 | — |
| Sculptra (per vial) | $700-$1,200 | ASPIRE Galderma Rewards |
| Bellafill | $800-$1,200 | — |
Total Cost by Treatment Goal
| Treatment Goal |
Syringes Needed |
Estimated Cost |
Frequency |
| Lip enhancement | 1-2 | $500-$1,200 | Every 6-12 months |
| Nasolabial folds only | 1-2 | $600-$1,800 | Every 9-18 months |
| Cheek restoration | 2-4 | $1,200-$3,600 | Every 12-24 months |
| Jawline contouring | 3-6 | $1,500-$4,800 | Every 12-18 months |
| Under-eye hollows | 1-2 | $600-$1,500 | Every 12-18 months |
| Chin projection | 1-2 | $600-$1,800 | Every 12-18 months |
| Full face rejuvenation | 6-12+ | $4,000-$10,000+ | Annually (partial top-ups) |
Save money on fillers: Sign up for manufacturer loyalty programs — Alle (Juvederm/Botox), ASPIRE (Restylane/Sculptra), and Merz Aesthetics (Radiesse/Belotero) all offer points, discounts, and rebates that can save $50-$200+ per treatment. Ask your provider about package pricing (buying multiple syringes at once for 10-20% off) and financing options through CareCredit, Cherry, or Alphaeon.
Side Effects & Risks
Common Side Effects (Normal, Temporary)
- Swelling: Most common side effect. Peaks at 24-48 hours and resolves within 2-7 days. Lips swell the most.
- Bruising: Occurs in 20-40% of treatments. Can last 5-10 days. More likely in patients taking blood thinners, fish oil, or NSAIDs.
- Redness: At injection sites. Resolves within hours to 2 days.
- Tenderness: Mild pain when touching the treated area. Resolves in 3-7 days.
- Firmness or lumps: The filler may feel firmer than expected initially. It softens and integrates into tissue over 1-2 weeks.
Less Common Side Effects
- Asymmetry: One side may swell more than the other, creating temporary unevenness. If asymmetry persists after 2 weeks, a touch-up can correct it.
- Tyndall effect: A bluish discoloration that occurs when HA filler is placed too superficially, especially under thin skin (under eyes). May require dissolution.
- Filler migration: Product moves from the original placement over time. Most common in lips. Minimized by proper technique and product selection.
- Nodules: Small, firm lumps that may be visible or palpable. Can sometimes be massaged out or dissolved.
Rare but Serious Risks
Vascular occlusion is the most serious filler complication. It occurs when filler is injected into or compresses a blood vessel, blocking blood flow. Signs include: intense pain, blanching (skin turning white), dusky discoloration, or visual changes (if near the eye). This is a medical emergency requiring immediate treatment with hyaluronidase to dissolve the filler. The risk is significantly reduced by choosing a trained, experienced injector who understands vascular anatomy and uses aspiration technique and/or cannulas in high-risk areas.
- Infection: Rare when proper sterile technique is used. Signs include increasing redness, warmth, pain, and fever days after treatment.
- Allergic reaction: Extremely rare with HA fillers. Bellafill requires a skin test before treatment due to its collagen component.
- Biofilm: Bacterial biofilm can form around filler particles, causing delayed-onset nodules or inflammation weeks to months later.
Aftercare Instructions
DO (First 48-72 Hours)
- Apply ice for 10-15 minutes on/off to reduce swelling
- Sleep elevated (extra pillow) for the first 1-2 nights
- Stay hydrated — HA fillers bind water
- Take arnica supplements to reduce bruising
- Use gentle skincare products
- Take acetaminophen (Tylenol) for discomfort if needed
- Contact your provider if you notice unusual pain, color changes, or vision issues
DON'T (First 48-72 Hours)
- Exercise strenuously for 24-48 hours
- Massage or press on treated areas (unless your injector instructs you to)
- Consume alcohol for 24 hours (increases bruising)
- Take NSAIDs (ibuprofen, aspirin) — increases bruising
- Apply heat, saunas, or hot yoga for 48 hours
- Get dental work for 2 weeks (for lip/lower face fillers)
- Fly on an airplane for 24-48 hours (pressure changes may increase swelling)
- Sleep face-down on treated areas
Dissolving Fillers (Hyaluronidase)
One of the biggest advantages of HA fillers is that they can be dissolved if needed. The enzyme hyaluronidase (brand names: Hylenex, Vitrase) breaks down hyaluronic acid within 24-48 hours.
When Dissolution Is Used
- Vascular occlusion emergency: Immediate dissolution to restore blood flow
- Overcorrection: Too much filler creating an unnatural appearance
- Asymmetry: Uneven results that can't be corrected by adding more
- Filler migration: Product that has moved from its intended position
- Tyndall effect: Bluish discoloration from superficially placed filler
- Patient dissatisfaction: Patient simply doesn't like the result
- Nodules or lumps: Palpable irregularities that don't resolve with massage
Important limitations: Hyaluronidase only dissolves
HA fillers. It does not work on Radiesse (CaHA),
Sculptra (PLLA), or Bellafill (PMMA). These non-HA fillers must be absorbed by the body over time. This is a major factor in recommending HA fillers for first-time patients — the ability to reverse results provides an essential safety net.
Am I a Good Candidate?
Ideal Candidates
- Adults experiencing age-related volume loss in the cheeks, temples, or midface
- Patients with moderate to deep wrinkles and folds (nasolabial, marionette lines)
- Those wanting enhanced facial contours (sharper jawline, more projected chin, fuller cheeks)
- Patients seeking lip enhancement (volume, shape, or symmetry)
- Those with under-eye hollows or dark circles from volume loss
- Patients with realistic expectations who understand fillers enhance but don't replace surgery
- Anyone wanting results without surgery and with minimal downtime
Who Should NOT Get Fillers
- Pregnant or breastfeeding women
- Patients with active skin infections (herpes outbreak, acne, cellulitis) at the treatment site
- Those with autoimmune disorders that affect connective tissue (scleroderma, lupus)
- Patients with a history of severe allergies or anaphylaxis
- Those with bleeding disorders or on blood thinners (relative contraindication — discuss with provider)
- Patients who have had permanent fillers in the area (can complicate treatment)
- Anyone with unrealistic expectations of what non-surgical treatment can achieve
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Frequently Asked Questions
What are dermal fillers?
Dermal fillers are injectable gel-like substances used to restore facial volume, smooth wrinkles, enhance contours, and reduce the appearance of scars. Most are made of hyaluronic acid (HA), a naturally occurring molecule in skin. Other types include Radiesse (calcium hydroxylapatite), Sculptra (poly-L-lactic acid), and Bellafill (PMMA). Results are immediate and last 6-24 months depending on the product and treatment area.
How much do dermal fillers cost?
Dermal fillers cost $500-$1,200 per syringe. Total treatment costs depend on the area and number of syringes: lips $500-$1,200, nasolabial folds $600-$1,800, cheeks $1,200-$3,600, jawline $1,500-$4,800, under eyes $600-$1,500, and full face $4,000-$10,000+. Save money with manufacturer loyalty programs (Alle, ASPIRE) and package deals.
How long do dermal fillers last?
Filler duration depends on the product and area: lip fillers 6-12 months, nasolabial fold fillers 9-18 months, cheek fillers 12-24 months (Voluma), jawline fillers 12-18 months, under-eye fillers 12-18 months. Radiesse lasts 12-18 months, Sculptra 2-5 years, and Bellafill 5+ years. High-movement areas like lips break down filler faster. Metabolism, lifestyle, and sun exposure also affect longevity.
What are the side effects of dermal fillers?
Common, temporary side effects include swelling (2-7 days), bruising (5-10 days), redness, tenderness, and initial firmness. Less common issues include asymmetry, Tyndall effect (bluish tint under thin skin), filler migration, and nodules. The most serious rare risk is vascular occlusion (blocked blood vessel), which is a medical emergency treated with hyaluronidase. Choosing a trained, experienced injector significantly reduces all risks.
What is the best filler for cheeks?
The best cheek fillers are thicker products with strong lifting capacity: Juvederm Voluma XC (lasts up to 2 years), Restylane Lyft (strong lift), Restylane Contour (flexible lift), RHA 4 (dynamic support), and Radiesse (volume + collagen stimulation). Most patients need 2-4 syringes total (1-2 per side) for noticeable enhancement. Your injector will recommend the best product based on your specific anatomy and goals.
Can dermal fillers be dissolved?
HA (hyaluronic acid) fillers can be dissolved with hyaluronidase enzyme within 24-48 hours. This is used for emergencies (vascular occlusion), overcorrection, migration, or patient dissatisfaction. However, non-HA fillers — Radiesse, Sculptra, and Bellafill — cannot be dissolved and must be absorbed naturally over time. This reversibility is a major reason HA fillers are recommended for first-time patients.
What is filler migration?
Filler migration occurs when injected filler moves from its original placement, creating an unintended appearance. It's most common in the lips (filler spreading above the lip line). Causes include overfilling, wrong product choice, incorrect injection depth, excessive massage, and repeated treatments. Prevention: choose an experienced injector, use the right product for each area, and follow aftercare instructions. Migrated HA filler can be dissolved with hyaluronidase.
What is the difference between Juvederm and Restylane?
Both are HA filler families but differ in manufacturing technology. Juvederm (Allergan) uses Vycross/Hylacross technology for a smoother gel. Restylane (Galderma) uses NASHA/OBT technology for a firmer, more granular texture. Juvederm tends to spread more (good for smooth blending), while Restylane holds its shape better (good for structure). Both are safe, FDA-approved, and effective. Many injectors use products from both families in the same treatment session.
Do dermal fillers hurt?
Most patients rate filler injections at 3-5 out of 10 on a pain scale. Discomfort is minimized by: topical numbing cream (applied 15-20 minutes before), dental blocks for lip and lower face treatments, and built-in lidocaine in most modern fillers. The lips and nasolabial folds are the most sensitive areas. The injection process takes 15-45 minutes. Most patients find the procedure very tolerable.
How many syringes of filler do I need?
It depends on the area: lips 1-2 syringes, nasolabial folds 1-2, cheeks 2-4 total, jawline 3-6, chin 1-2, under eyes 1-2, temples 2-4, and full face 6-12+. First-time patients should start conservatively — you can always add more at a 2-week follow-up. Maintenance treatments typically require fewer syringes than initial treatments since residual filler remains.
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