Excessive gum display while smiling — medically termed gummy smile (gingival smile) — affects approximately 10–25% of the adult population worldwide. As of 2026, botulinum toxin A (BTX-A) injection is the most frequently preferred minimally invasive method for correcting this condition. At Virtuana Clinic, gummy smile botox applications are performed in accordance with scientific protocols.
This guide covers everything from LLSAN muscle anatomy and classification systems to dosage tables and surgical comparisons.
Quick Answer: What Is Gummy Smile Botox and How Does It Work?
Gummy smile botox is the temporary weakening of the upper lip elevator muscles that cause the gums to be visible by more than 2 mm when smiling, using botulinum toxin. The procedure takes an average of 5–10 minutes, uses a total of 4–10 units of BTX-A, and the full effect appears within 2–4 weeks. Results last 3–6 months. According to American Academy of Dermatology data, patient satisfaction exceeds 92%.
Key information table:
| Feature | Detail |
|---|---|
| Procedure time | 5–10 minutes |
| Total dose | 4–10 units BTX-A |
| Onset of effect | 3–5 days |
| Full effect | 2–4 weeks |
| Duration of effect | 3–6 months |
| Recovery time | None (immediate return to daily activities) |
| Satisfaction rate | 92%+ |
| Pain level | Minimal (VAS 1–2/10) |
What Is a Gummy Smile (Gingival Smile)?
Gummy smile is a medical term describing a condition where the upper gums are visible by more than 2 mm during smiling. In a normal smile, the gums are visible by 0–2 mm, whereas in a gummy smile, this can range from 3 mm to 10+ mm. According to the American Academy of Periodontology, it is twice as common in women compared to men; the general prevalence is approximately 14% in women and 7% in men.
Dental research shows that when gum display exceeds 3 mm, most people consider it aesthetically undesirable. Display of 4 mm and above is classified as a significant gummy smile.
Gummy Smile Measurement Parameters
- Anterior gingival display (AGD): Gum visibility above the upper incisors (in mm)
- Posterior gingival display: Gum visibility in the premolar and molar region
- Upper lip position: Lip line in resting and dynamic position
- Smile height: Lip elevation distance (average 7–8 mm)
- Dental-gingival ratio: Ratio of tooth length to gingival margin
Gummy Smile Classification System (Types I–IV)
The gummy smile classification system is a clinical assessment tool that determines the severity and cause of gum display to guide appropriate treatment planning. Correct classification is critically important for directing treatment. The Mercado-Rosso classification and the extended clinical classification system are the most widely used methods.
Classification by Severity
| Grade | Gum Display | Severity | Botox Suitability |
|---|---|---|---|
| Grade I (Mild) | 2–4 mm | Mild | Botox alone is sufficient |
| Grade II (Moderate) | 4–6 mm | Moderate | Botox + lip filler combination |
| Grade III (Severe) | 6–8 mm | Severe | Botox + surgical evaluation |
| Grade IV (Very Severe) | 8+ mm | Very severe | Surgery-first treatment |
Mercado-Rosso Classification System
The Mercado-Rosso classification divides gummy smile into three main types that guide the treatment approach:
- Type 1 — Bone-soft tissue support deficiency: Gummy smile resulting from insufficient support or projection deficiency of the upper jaw (maxilla). Skeletal correction or volume augmentation with filler may be required in this type.
- Type 2 — Muscle force-resistance imbalance: A condition arising from an imbalance between the excessive force of the levator muscles and soft tissue resistance. Botox treatment is the most effective option for this type.
- Type 3 — Zygomatic muscle hyperfunction: Broad smile and excessive display of the molar teeth due to excessive activation of the zygomatic muscles. Also called lateral gummy smile.
Aetiological Classification
- Muscular type: Hyperfunction of the upper lip elevator muscles (60–70% of cases)
- Skeletal type: Vertical maxillary excess (15–20% of cases)
- Dental type: Delayed passive eruption, short clinical crown (10–15% of cases)
- Mucosal type: Thick or hypertrophic gingival tissue (5–10% of cases)
LLSAN Muscle Anatomy: Detailed Examination
Levator labii superioris alaeque nasi (LLSAN) is a facial muscle extending from the nasal margin to the upper lip that plays the primary role in gummy smile formation. Anatomical studies show that LLSAN is the dominant muscle in more than 85% of gummy smile cases. Understanding the detailed anatomy of this muscle forms the foundation of successful botox treatment.
Upper Lip Elevator Muscles
| Muscle | Origin | Insertion | Function | Nerve |
|---|---|---|---|---|
| LLSAN | Frontal process (maxilla) | Upper lip and nasal ala | Lip and nose elevation | Buccal branch (CN VII) |
| LLS (Levator labii superioris) | Infraorbital margin | Upper lip | Lip elevation | Buccal branch (CN VII) |
| ZMi (Zygomaticus minor) | Zygomatic bone | Upper lip | Lip elevation + lateral traction | Buccal branch (CN VII) |
| ZMa (Zygomaticus major) | Zygomatic arch | Modiolus | Mouth corner elevation | Buccal branch (CN VII) |
LLSAN Anatomical Details
- Length: Average 4.5–5.5 cm
- Width: 8–10 mm at origin point, 15–20 mm at insertion
- Depth: 6–8 mm deep from the skin surface
- Angle to facial midline: Average 25.8 ± 4.8 degrees (LLS), 55.7 ± 6.4 degrees (ZMi)
- Vascularisation: Superior labial artery and angular artery branches
- Innervation: Buccal branch of the facial nerve
Muscle Convergence Zone (Yonsei Point)
The LLSAN, LLS and ZMi muscles converge in a triangular region lateral to the nasal ala. This convergence point is called the Yonsei point and is the target point for gummy smile botox injection:
- Horizontal position: 1 cm lateral from the ala nasi
- Vertical position: 3 cm superior to the lip line
- Depth: Approximately 6–7 mm from the skin surface
Causes of Gummy Smile
The causes of gummy smile range from muscle hyperfunction to skeletal anomalies, and determining the aetiology is essential for correct treatment planning. Research shows that muscle hyperfunction is the primary cause in 60–70% of cases.
Muscular Causes
- LLSAN hyperfunction: The most common cause; excessive contraction capacity of the muscle
- LLS hypertonicity: Excessive lifting of the upper lip
- Muscle coordination disorder: Imbalance between levator and depressor muscles
- Genetic predisposition: Family history positive in 45% of cases
Skeletal Causes
- Vertical maxillary excess (VME): Excessive vertical growth of the upper jaw bone
- Alveolar bone hypertrophy: Excess of the bone tissue surrounding the tooth roots
- Anterior-posterior maxilla position: Forward positioning of the upper jaw
Dental Causes
- Delayed passive eruption: Failure of the gums to recede to normal level
- Short clinical crown: Tooth appearing shorter than normal
- Compensatory supra-eruption: Related to opposite jaw deficiency
Soft Tissue Causes
- Short upper lip: Normal length 20–22 mm; short lip <18 mm
- Thin lip vermilion: Thinness of the red portion of the lip
- Hypertrophic gingiva: Thickening of gingival tissue
How Does Gummy Smile Botox Work?
Gummy smile botox reduces the contraction force of the upper lip elevator muscles by inhibiting acetylcholine release at the neuromuscular junction, thereby limiting gum visibility during smiling. This mechanism is reversible and the effect completely disappears within 3–6 months.
Mechanism of Action Step by Step
- Injection: BTX-A molecule is injected into the target muscle area
- Binding: The toxin binds to SV2 receptors on the presynaptic nerve terminal
- Internalisation: The receptor-toxin complex is taken up into the cell
- SNARE protein cleavage: The light chain cleaves the SNAP-25 protein
- Acetylcholine blockade: Neurotransmitter release at the neuromuscular junction is inhibited
- Muscle relaxation: The contraction force of the target muscle decreases by 50–80%
- Clinical effect: Gum visibility during smiling decreases by 2–4 mm
Effect Timeline
| Period | Day | Clinical Status |
|---|---|---|
| Latent period | 0–3 days | Toxin binding and internalisation |
| Early effect | 3–5 days | First muscle weakness felt |
| Increasing effect | 5–14 days | Progressive muscle relaxation |
| Full effect | 14–28 days | Maximum gum reduction |
| Plateau | 1–3 months | Stable result period |
| Decline | 3–5 months | Return of muscle function |
| Full recovery | 5–6 months | Return to normal muscle function |
Injection Points and Technical Details
Gummy smile botox injection is applied at precise doses to specific points targeting the LLSAN, nasalis, and orbicularis oris muscles, and the Yonsei point technique is the most widely used scientific method. The correct injection point is the most critical factor for a successful outcome.
Yonsei Point Technique
The Yonsei point is a 2-point injection technique developed at Yonsei University in South Korea that targets the convergence point of the LLSAN, LLS, and ZMi muscles:
- Point determination: 1 cm lateral from the ala nasi, 3 cm superior to the lip line
- Needle selection: 30G needle, 13 mm length
- Injection depth: Approximately 6–7 mm (mid-muscle depth)
- Dose: 2–3 units BTX-A per point
- Total: 4–6 units with bilateral application
Multiple Injection Point Technique
Additional injection points may be used in severe cases:
| Injection Point | Target Muscle | Dose (Units) | Indication |
|---|---|---|---|
| Yonsei point (bilateral) | LLSAN/LLS/ZMi convergence | 2–3 × 2 sides | All types |
| Nasal alar point | Nasalis muscle | 1–2 × 2 sides | If nasal elevation accompanies |
| Superior orbicularis | Orbicularis oris (upper) | 1–2 × 2 sides | If lip flip is also required |
| Lateral alar point | ZMa connection point | 1–2 × 2 sides | Lateral gummy smile |
Injection Safety Rules
- Aspiration test: Should be applied before each injection
- Angular artery protection: Attention to the artery running along the nasal margin
- Symmetry control: Equal dose and same depth on both sides
- Maximum dose: Should not exceed 10 units in total for the first session
- Follow-up appointment: Assessment 2 weeks later and additional dose if required
Dosage Table: Botox Amount by Severity
Gummy smile botox dosage is determined individually based on the severity of gum display, aetiological cause, and the patient's muscle structure; it generally ranges between 4–10 units in total. Starting low and increasing if necessary (conservative approach) is safe clinical practice.
| Severity | Gum Display | Recommended Dose (Total) | Number of Points | Repeat Interval |
|---|---|---|---|---|
| Mild | 2–4 mm | 4 units (2+2) | 2 (Yonsei bilateral) | 4–6 months |
| Moderate | 4–6 mm | 6–8 units (3+3 or 4+4) | 2–4 | 3–5 months |
| Severe | 6–8 mm | 8–10 units | 4–6 | 3–4 months |
| Very severe | 8+ mm | 10 units + combined treatment | 4–6 | 3–4 months |
Dosing Principles
- Low dose at first session: Safe approach with 2 units/side to start
- 2-week check: If effect is insufficient, an additional 1–2 units/side can be applied
- Maximum first session dose: 5 units/side (total 10 units)
- Optimisation at repeat sessions: Dose adjustment based on patient response
- Asymmetry correction: Additional 0.5–1 unit on one side
Difference Between Lip Flip and Gummy Smile Botox
Lip flip is a technique where low-dose botox is injected into the upper edge of the orbicularis oris muscle to cause the upper lip to roll outward, whereas gummy smile botox targets the upper lip elevator muscles (LLSAN) to reduce gum visibility. Both techniques have different indications but can also be combined.
| Feature | Lip Flip | Gummy Smile Botox |
|---|---|---|
| Target muscle | Orbicularis oris (upper edge) | LLSAN, LLS, ZMi |
| Injection point | Above lip vermilion border | Lateral to ala nasi (Yonsei point) |
| Dose | 2–4 units total | 4–10 units total |
| Goal | Increasing appearance of lip volume | Reducing gum visibility |
| Duration of effect | 6–8 weeks | 3–6 months |
| Functional effect | May affect straw/kissing use | May affect smile width |
| Combined use | Together with gummy smile treatment | Together with lip flip |
When Lip Flip, When Gummy Smile Botox?
- Lip flip only: Thin upper lip, no gum problem
- Gummy smile botox only: Significant gum display, adequate lip volume
- Combined: Both gum display and thin lip problem together
How Is Gummy Smile Botox Applied? (Step by Step)
The gummy smile botox application follows a systematic protocol from consultation to final check, and the total procedure time including injection does not exceed 15–20 minutes.
Application Protocol
- Consultation and assessment (5–10 minutes)
— Smile analysis and gum measurement
— Classification (Type I–IV) determination
— Photo documentation (resting + smiling)
— Treatment plan and expectation management
- Preparation (2–3 minutes)
— Facial cleansing and antisepsis
— Marking of injection points
— Optional topical anaesthesia (EMLA cream)
- Injection (3–5 minutes)
— Bilateral injection to Yonsei point with 30G needle
— 2–3 units BTX-A per point
— Additional injection points if required
— Aspiration test before each injection
- Post-procedure (2–3 minutes)
— Ice application
— Patient information
— Follow-up appointment scheduled (14 days later)
Duration of Effect and Repeat Session Planning
Gummy smile botox effect lasts an average of 3–6 months and after the first application the effect duration is usually shorter, extending up to 6 months with regular applications. Clinical studies show that the duration of effect increases significantly from the 3rd session onwards.
| Session | Average Duration of Effect | Optimal Repeat Timing |
|---|---|---|
| 1st session | 3–4 months | When effect begins to diminish |
| 2nd session | 4–5 months | At month 4 |
| 3rd session | 5–6 months | At month 5 |
| 4th+ session | 5–6+ months | At months 5–6 |
Factors Affecting Duration of Effect
- Metabolic rate: High metabolism = shorter effect
- Physical activity: Intense exercise may shorten effect duration
- Dose: Application at optimal dose provides longer effect
- Muscle mass: Stronger muscles recover faster
- Age: Faster metabolism in younger patients
Pain and Comfort Management
Gummy smile botox injection causes minimal pain; owing to the use of fine needles and the short procedure time, more than 90% of patients rate pain as 1–2/10 on the VAS scale.
Pain Management Strategies
- Topical anaesthesia: EMLA cream (2.5% lidocaine + 2.5% prilocaine) — applied 20–30 minutes before the procedure
- Ice application: 1–2 minutes of ice before injection — provides local numbing
- Vibration analgesia: Use of a vibration device during injection
- Fine needle: Use of 30G or 32G needle
- Rapid injection: <5 seconds/point with an experienced practitioner
Side Effects and Complications
Gummy smile botox side effects are generally mild and transient; according to systematic reviews, the complication rate is below 5% and serious side effects are extremely rare.
Possible Side Effects
| Side Effect | Frequency | Duration | Management |
|---|---|---|---|
| Redness at injection site | 30–40% | 1–2 hours | Ice application |
| Mild bruising | 10–15% | 3–7 days | Arnica gel |
| Smile asymmetry | 3–5% | 2–4 weeks | Dose adjustment (at check session) |
| Upper lip droop | 1–3% | 2–6 weeks | Minimised with low dose |
| Nasolabial asymmetry | 1–2% | 2–4 weeks | Unilateral correction dose |
| Dry mouth | <1% | Transient | Hydration |
Preventing Complications
- Low dose start: Conservative approach at first session
- Anatomical knowledge: Detailed knowledge of LLSAN muscle anatomy
- Correct depth: Injection at target depth of 6–7 mm
- Aspiration: Preventing intravascular injection
- Symmetry: Equal bilateral dosing
Who Is and Who Is Not a Candidate?
Gummy smile botox can be applied to healthy individuals over 18 with muscular-aetiology gingival smile; in skeletal or dental cases, it may not be sufficient on its own. Comprehensive assessment is essential before treatment.
Suitable Candidates
- Muscular type gummy smile (Mercado-Rosso Type 2)
- Healthy individuals over 18
- Mild-to-moderate gum display (2–6 mm)
- Patients not wishing surgery
- Women not planning pregnancy
- Individuals without botulinum toxin allergy
Contraindications
| Absolute Contraindication | Relative Contraindication |
|---|---|
| Botulinum toxin allergy | Severe gummy smile (8+ mm) |
| Pregnancy/breastfeeding | Skeletal-origin case |
| Neuromuscular disease (MG, ALS) | Active facial infection |
| Infection at injection site | Anticoagulant use |
| Aminoglycoside antibiotic use | Previous facial surgery |
Gummy Smile Botox vs. Surgical Treatment Comparison
Gummy smile botox is a minimally invasive, reversible treatment, whereas surgical methods (Le Fort I osteotomy, gingivectomy, lip repositioning) are permanent but more invasive options. Treatment selection should be made considering severity grade, aetiology, and patient preference.
Comprehensive Comparison Table
| Feature | Botox | Gingivectomy | Lip Repositioning | Le Fort I |
|---|---|---|---|---|
| Invasiveness | Minimal | Minimal-moderate | Moderate | Major surgery |
| Anaesthesia | Topical/none | Local | Local/general | General |
| Procedure time | 5–10 min | 30–60 min | 60–90 min | 3–5 hours |
| Recovery | 0 days | 7–14 days | 14–21 days | 6–8 weeks |
| Permanence | 3–6 months | Permanent | Permanent | Permanent |
| Reversibility | Yes | Limited | Partially | No |
| Success rate | 85–92% | 90–95% | 80–90% | 95%+ |
| Risk profile | Very low | Low | Moderate | High |
| Suitable severity | Mild-moderate | Dental cause | Muscular/soft tissue | Skeletal |
Combination Treatment: Gummy Smile Botox + Lip Filler
Combining gummy smile botox and lip filler provides a synergistic aesthetic result by both reducing gum display and increasing lip volume. According to clinical data, combination treatment increases patient satisfaction by 15–20% compared to botox alone.
Combination Protocol
- Step 1 — Botox (Day 0):
— Bilateral injection to Yonsei point
— Total 4–8 units BTX-A
— 2–4 units to upper orbicularis edge for lip flip if indicated
- Step 2 — Filler (14–21 days later):
— After botox effect has stabilised
— Upper lip augmentation with hyaluronic acid (HA) filler
— 0.5–1 ml HA filler
- Review (day 28–30):
— Symmetry and aesthetic result assessment
— Fine-tuning if required
Why Botox First?
- Lip position changes with the botox effect
- Lip volume requirement is more clearly determined after botox
- Filler placement is more predictable after the botox effect has stabilised
Post-Treatment Care After Gummy Smile Botox
The basic care rules after gummy smile botox are to avoid touching the injection site, lying face down, and intense physical activity for the first 24 hours. Adherence to these rules is critical for optimal results and minimising complication risk.
First 4 Hours
- Do not touch or rub the injection site
- Remain in an upright position
- Do not apply make-up
- Avoid hot drinks
First 24 Hours
- Do not perform intense exercise
- Do not lie face down
- Do not consume alcohol
- Do not go to a sauna/steam room
- Avoid prolonged sun exposure
First 2 Weeks
- Postpone dental treatment appointments
- Avoid facial massage
- Do not start smile exercises early
- Attend the day-14 follow-up appointment
Social Impact and Confidence Studies
87% of patients report a positive change in their social interactions and 78% in their professional lives following gummy smile treatment. Research demonstrates that smile aesthetics have a direct effect on individual self-confidence.
Clinical Research Findings
- Confidence increase: Average VAS confidence score increased by 3.2 points (40% improvement) post-treatment
- Reduced social anxiety: Smile-related anxiety reduced by 65%
- Photography willingness: 82% of patients more willing to be photographed after treatment
- Professional impact: 73% participant rate agreeing that smile aesthetics create a positive impression in job interviews
- Relationship satisfaction: 68% increase in smile satisfaction in romantic relationships
Pricing
Gummy smile botox pricing varies depending on the product brand used, the total dose injected, the practitioner's experience, and the clinic's location. Please contact us for current pricing at Virtuana Clinic. A consultation appointment is recommended.
Frequently Asked Questions (FAQ)
1. Is gummy smile botox permanent?
Gummy smile botox is not permanent. The effect of botulinum toxin lasts 3–6 months, after which muscle function fully returns. For patients seeking a permanent result, surgical options such as gingivectomy or lip repositioning can be considered. However, with regular botox applications, muscle atrophy may develop and the duration of effect may lengthen.
2. Is gummy smile botox painful?
Gummy smile botox injection causes minimal pain. Over 90% of patients rate the pain as 1–2 out of 10. Pain can be almost completely eliminated with the use of a 30G fine needle and topical anaesthesia. The procedure takes 5–10 minutes in total.
3. When will the effect be seen after gummy smile botox?
The first effect begins within 3–5 days; the full effect appears within 2–4 weeks. Botulinum toxin blocks acetylcholine release at the neuromuscular junction by cleaving the SNAP-25 protein; this process takes several days. Assessment is made at the day-14 follow-up appointment.
4. Will gummy smile botox completely change my smile?
No, gummy smile botox applied at the correct dose preserves a natural smile. The aim is not to prevent smiling but to reduce gum visibility by 2–4 mm. Experienced practitioners reduce muscle force by 50–80% to achieve a natural smile.
5. Are gummy smile botox and lip flip the same procedure?
No, gummy smile botox and lip flip are different procedures. Gummy smile botox targets the LLSAN muscle to reduce gum visibility, while lip flip targets the upper edge of the orbicularis oris muscle to cause the lip to roll outward. However, both techniques can be combined in the same session.
6. Who cannot receive gummy smile botox?
It cannot be applied during pregnancy/breastfeeding, to those with a diagnosis of neuromuscular disease (myasthenia gravis, ALS), those with botulinum toxin allergy, and those with active infection at the injection site. Caution is also required in patients using aminoglycoside antibiotics.
7. How much does gummy smile botox cost?
Pricing varies depending on the product brand used, total dose, practitioner experience, and clinic location. A consultation appointment is recommended for current pricing at Virtuana Clinic.
8. Can I eat after gummy smile botox?
Yes, you can eat immediately after gummy smile botox. However, it is recommended to avoid very hot food and drinks for the first 4 hours. Straw use should be avoided for the first 24 hours. Normal eating can resume immediately.
9. How many units does gummy smile botox require?
Gummy smile botox generally requires 4–10 units in total. In mild cases (2–4 mm gum display) 4 units (2 per side); in moderate cases 6–8 units; in severe cases 8–10 units are applied. Starting with a low dose at the first session and evaluating 2 weeks later is recommended.
10. Can gummy smile botox and filler be done at the same time?
Gummy smile botox and lip filler can be done in the same session, but sequential application is ideal. Botox is applied first; lip filler is planned 14–21 days later once the botox effect has stabilised. This approach provides more predictable and aesthetic results.
11. Can gummy smile botox also be applied to men?
Yes, gummy smile botox can also be applied to men. The prevalence of gummy smile in men is around 7%, which is lower than in women. Since men generally have greater muscle mass, the dose may be increased by 10–20%.
12. Can I exercise after gummy smile botox?
Intense exercise is not recommended for the first 24 hours after gummy smile botox. Intense physical activity can increase blood circulation and affect the diffusion of botox. Light exercise can be resumed after 24 hours, and a normal exercise routine after 48 hours.
13. Does gummy smile botox look natural?
With the correct dose and technique, gummy smile botox looks completely natural. The aim is not to freeze the smile but to reduce gum visibility. Experienced practitioners achieve a natural and aesthetic result in 92% of patients. Those around the patient generally do not notice the treatment.
14. When do gummy smile botox results look their best?
Gummy smile botox results reach their best appearance 2–4 weeks after injection. During this period the toxin shows its full effect and muscle relaxation is optimised. The result is evaluated at the week-2 follow-up appointment and fine-tuned if necessary.
15. Is only botox used for gummy smile treatment?
No. In addition to botox, options such as gingivectomy, lip repositioning, Le Fort I osteotomy, orthodontics, and lip filler are also available for gummy smile treatment. Treatment choice is determined by the aetiology: botox is most suitable for muscular cases, gingivectomy for dental cases, and surgery for skeletal cases.
Conclusion
Gummy smile botox is the gold standard in the minimally invasive treatment of gingival smile. With a procedure time of 5–10 minutes, a satisfaction rate exceeding 92%, and a low complication risk, it is a safe and effective option. Correct classification, appropriate dosing, and selection of an experienced practitioner form the foundation of successful outcomes.
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