If you show too much gum when you smile, you might be bothered by what's called a "gummy smile." This affects about 1 in 10 people, and for many, it's their biggest aesthetic concern. The good news is that several effective treatments exist, and your dentist can help you figure out which one is best for you. But first, you need to understand what's causing it, because different causes need different treatments.
What's Actually Normal?
When you smile, showing 1-3mm of gum is considered ideal and aesthetically pleasing. If you're showing more than 3-4mm, that's when people typically start feeling self-conscious. The important thing is that gummy smile is pretty subjective—what bothers one person might not bother another. But if it bothers you and you're thinking about treatment, there are definitely options.
Your dentist will take special photos of you smiling to measure exactly how much gum you're showing. They'll also look at your teeth (how long they look), your lip position and movement, and the overall proportions of your face. They might even take 3D X-rays to look at bone anatomy underneath.
Altered Passive Eruption: Too Much Gum Tissue
About 12% of gummy smiles happen because too much gum is covering the teeth. Your teeth actually erupted (came down) normally, but thick gum tissue is still covering them. Your gum pockets are healthy (normal 1-3mm depth), but the gingival margin is positioned lower than ideal, making your teeth look shorter than they really are.
This is fixable with a periodontal procedure called crown lengthening. Your dentist removes bone below the gum line and lets the gum settle to a new, higher position. This makes your teeth look longer and your smile look less gummy.
It's a surgical procedure, but it's pretty straightforward. After healing (3-6 months), your gums will stabilize in their new position. This is a permanent fix that typically gives excellent results.
Vertical Maxillary Excess: Skeletal Issue
About 20% of gummy smiles happen because the upper jaw extends too much vertically. Your face is disproportionate—the distance from your nose to your chin is too long, and your upper jaw positioning is too low. This isn't about gum tissue or how much teeth erupted; it's about your skeletal structure.
This requires major orthognathic surgery—basically, your surgeon repositions your entire upper jaw upward. This is called a LeFort I impaction. It's not a minor procedure—you'll need braces before surgery, then surgery, then braces after for about 18-24 months total. But it fixes not just the gummy smile; it also improves facial proportions.
There's also a less invasive option called distraction osteogenesis, where a device gradually pulls your upper jaw into position over several weeks, but this is less commonly done and still requires orthodontics.
Short Upper Lip
About 15% of gummy smiles happen simply because your upper lip is naturally short. When you smile, your lip moves upward (averages 7-8mm), but a short lip doesn't cover much tooth/gum. Some people just genetically have less lip tissue.
Surgical solutions for this are complex and have variable results. Your surgeon might try to lengthen your lip, but this involves grafting and potential scarring. The other option is working with what you have through other treatments, or accepting your smile—which is also completely valid.
Hypermobile Lip: Most Common
About 35% of gummy smiles happen because your upper lip moves up too much when you smile. Your lip length is normal, but when you smile, it elevates more than 8mm (normal is 7-8mm). The muscles controlling lip movement are overactive. This is actually the most common cause of gummy smile, and it's also the easiest to fix.
The solution is botulinum toxin (Botox) injections into the muscles that elevate your upper lip. Injections go into the LLSAN muscle (levator labii superioris alaeque nasi) and surrounding muscles. This relaxes these muscles so your lip doesn't elevate as much when you smile, reducing gummy display.
Dosing is usually 2.5-5 units per muscle per side (5-15 units total bilateral), adjusted based on results. Effects take 3-7 days to appear, with full effect at 2-3 weeks. Duration is about 3-4 months, then you'd need re-injection. This is completely reversible—if you don't like it, you just stop getting injections and the effect wears off.
Cost is typically $300-600 per treatment session, which lasts 3-4 months. So annually you're looking at $1200-2400 for upkeep. That's more expensive than most people expect, but there's no surgery, no recovery time, and it's reversible.
Many People Have Multiple Causes
Don't assume you have just one cause. Many gummy smile patients have altered passive eruption plus hypermobile lip, or vertical maxillary excess plus short lip. Treatment works best when you address all the contributing factors. Your dentist can help identify everything that's contributing to your particular gummy smile.
Combination Treatment: Often the Best Approach
The smartest approach is usually to start with the least invasive option first. If you have hypermobile lip (most common), start with Botox. You do 2-3 treatment cycles to see how much of your gummy smile it fixes.
If that's enough, great—you're done. If there's still gummy display, then add surgical treatment. Or if you know you want permanent results and don't want ongoing injections, go straight to surgery.
If you have altered passive eruption, crown lengthening is the clear choice. If you have vertical maxillary excess, orthognathic surgery is needed for complete correction. Many people combine Botox with surgical treatments for best results.
Treatment Timing and Sequencing
Start with less invasive treatments (Botox) and see how much improvement you get. You can always add more. Once you know what your goals are and what less invasive treatments accomplish, you can decide if surgical treatment makes sense for you.
If surgery is planned, do that first. It provides the foundation, then Botox can fine-tune if needed. Some people discover that after surgical correction, they don't need Botox because the gummy display is already fixed.
Digital Smile Design
Many dentists now use digital smile design, where they show you photos of your smile with different amounts of gingival display. This lets you see exactly what the goal looks like. Some software lets you see simulations of different treatment approaches. This really helps you understand what you're working toward and whether the change is worth the cost and recovery time.
Crown Lengthening with Osseous Recontouring
Crown lengthening with osseous recontouring addresses altered passive eruption by establishing ideal gingival margin position through controlled bone reduction. This periodontal surgical procedure removes bone crest 3-4mm apical to desired gingival margin position, allowing physiologic migration of gingival margin to new bone level.
Surgical technique involves partial-thickness flap elevation to expose alveolar crest. Supracrestal bone (bone apical to alveolar crest extending toward root apex) is removed with burs and hand instruments, keeping 3-4mm supracrestal tissue space (biological width) between bone crest and desired gingival margin position. Internal bevel incisions and simplified flap design help healing and minimize scarring.
Esthetic outcomes depend critically on achieving balanced anterior gingival display and ideal scallop contours. Excessive bone removal risks gingival recession in healed state. Not enough removal fails to achieve desired gingival height. Multiple tooth involvement requires careful contouring keeping anatomic gingival architecture.
Healing occurs over 3-6 months with complete gingival remodeling and margin steadying. Temporary aesthetic compromise occurs right away post-operatively as flaps heal and gingival contours remodel. Patient education regarding healing timeline prevents dissatisfaction during remodeling phase.
Vertical Maxillary Excess: Orthognathic Correction
Vertical maxillary excess causing disproportionate vertical facial proportions requires orthognathic surgical correction through LeFort I impaction—superior repositioning of maxilla establishing normal vertical facial relationships.
LeFort I osteotomy involves horizontal cut through maxilla above tooth roots, separating maxilla from skull base. Precise impaction (upward movement) of maxilla is achieved through fixation at level required to establish normal incisor-to-molar vertical relationship and ideal gingival display. The procedure typically impacts maxilla 3-8mm depending on skeletal deformity severity.
This full surgical procedure addresses not only gingival display but also other vertical maxillary excess manifestations: anterior open bite, long lower facial height, and obtuse nasolabial angle. Treatment requires orthodontic therapy before and after surgery (typically 18-24 months total duration), periodic follow-up, and acceptance of potential problems (neurosensory changes, relapse).
Other options to surgical impaction for mild cases include transosteal distraction osteogenesis—gradual bone repositioning through traction force applied to distraction devices. Superior results occur with slower distraction rate (1mm daily after 5-7 day latency period) over 2-3 week duration.
Short Upper Lip: Surgical Repositioning
Short upper lip (inadequate length) causing excessive gingival display may be treated surgically through lip lengthening or repositioning procedures. Surgical options include: lip advancement (moving lip mucosa superiorly), V-Y flap advancement increasing lip-to-teeth distance, or limited surgical change of buccal frenum reducing lip tension.
Limited frenum surgery addresses excessive frenum thickness and short frenum limiting lip elevation. Frenectomy or frenum repositioning lowers frenum insertion, allowing greater lip mobility and elevation potential. This minor procedure shows variable efficacy depending on frenum contribution to lip restriction.
More definitive short lip correction requires myotomy of levator muscles combined with soft tissue grafting or flap advancement. The complexity and potential morbidity of these procedures limit widespread adoption. Patients should carefully consider potential scarring, altered sensation, and modest aesthetic gains relative to invasive nature.
Hypermobile Lip: Botulinum Toxin Injection
Hypermobile upper lip (excessive vertical movement during smiling) responds excellently to botulinum toxin injection into levator muscles elevating the lip. Injection sites target: levator labii superioris, levator labii superioris alaeque nasi (LLSAN), and zygomaticus major muscles controlling lip elevation.
Standard doses range 2.5-5 units per muscle group per side (total 5-15 units bilateral), titrated based on patient anatomy and desired effect. Higher doses reduce lip elevation more dramatically, potentially overcorrecting to unnatural flattened smile. Lower doses provide subtle reduction keeping natural expression. Most injectors employ 4-5 units per side of LLSAN as starting point, adjusting based on response.
Onset of effect occurs 3-7 days post-injection, with maximal effect at 2-3 weeks. Duration averages 3-4 months, requiring periodic re-injection for maintained effect. Patients achieve reversibility if dissatisfied—effects dissipate without treatment.
Problems remain minimal but include: bruising at injection sites (2-5% incidence), temporary numbness or paresthesia, asymmetric smile if injection technique inadequate, and rare lip weakness if higher doses inadvertently diffuse to orbicularis oris. Careful injection technique and conservative dosing minimize problems.
Cost factors include: $300-600 per treatment (3-4 month duration), requiring 3-4 treatments annually for sustained effect—about $1200-2400 yearly. This greatly exceeds surgical other options though avoids surgical morbidity and recovery time.
Combination Therapy Approaches
Most cases benefit from mix approaches addressing multiple etiologic factors simultaneously. Patients with altered passive eruption plus hypermobile lip require both crown lengthening and Botox for optimal results. Vertical maxillary excess with short lip may require orthognathic impaction combined with Botox injection or lip advancement.
Treatment sequencing determines outcomes. Minor gingival display correction through Botox injection first allows assessment of goal achievement before invasive surgical treatment. If Botox alone not enough after 2-3 treatment cycles, surgical correction proceeds with benefit of clarified goals and realistic expectation adjustment.
Alternatively, surgical correction precedes Botox injection when significant skeletal or dental correction is required. Definitive surgical repositioning establishes baseline gingival display, then Botox fine-tunes result if minor hypermobility persists.
TAD-Assisted Intrusion for Mild VME
Temporary anchorage devices (TADs) enable intrusion of maxillary anterior teeth through orthodontic force, effectively reducing gingival display without surgical skeletal changes. This approach reserves orthognathic surgery for severe cases while providing orthodontically achievable reduction in mild vertical maxillary excess.
TAD placement in palatal mucosa with force application to anterior teeth achieves gradual intrusion over 4-6 months. Modest vertical correction (2-3mm) is achievable before TAD removal and retention phase. Esthetic crown height increases through intrusion, partially offsetting modest vertical skeletal discrepancy.
Digital Treatment Planning and Smile Design
Digital smile design utilizing patient photographs and digitally-modified images improves patient talking and goal alignment. Software tools enable simulation of proposed gingival display changes, tooth shade changes, and smile arc adjustments. Showing patients digitally-modified images with their proposed gingival display during smile consultation improves realistic expectation establishment.
Three-dimensional CBCT-based treatment planning enables precise surgical planning for crown lengthening, orthognathic correction, or distraction osteogenesis. Virtual surgical repositioning simulation allows accurate bone cutting guides and fixation planning.
Related reading: Risk and Concerns with Teeth Bleaching Safety and Cosmetic Gum Shaping: What Every Patient Should Know.
Conclusion
A gummy smile showing more than 3-4mm of gum when smiling affects about 10-15% of people and is one of the most common aesthetic complaints. Altered passive eruption (12% of cases) responds excellently to periodontal crown lengthening with bone recontouring, providing permanent improvement. Vertical maxillary excess (20% of cases) requires orthognathic surgery (LeFort I impaction) for correction, with orthodontics before and after surgery. Short upper lip (15% of cases) is difficult to surgically correct with variable results. Hypermobile lip (35% of cases)—the most common cause—responds excellently to botulinum toxin injection (2.5-5 units per side) with effects lasting 3-4 months.
Most gummy smiles result from multiple contributing factors and benefit from mix treatment. Starting with less invasive treatments (Botox) and adding surgical correction as needed provides a staged approach allowing adjustment of goals. Digital smile design improves patient talking and expectation setting. Treatment selection should match individual anatomy, aesthetic goals, willingness to accept ongoing upkeep (Botox), and acceptance of surgical recovery and cost. Understanding your specific cause guides appropriate treatment advice and realistic outcomes.
Vertical Maxillary Excess (20%): Increased anterior facial height relative to posterior dimensions creates skeletal discrepancy. Anterior maxilla extends vertically excessively, positioning incisor edge apically and increasing gingival display without dentoalveolar abnormality. CBCT confirms anterior maxillary vertical hypermobility and excessive intergingival distance (measured from incisor edge to molar cusp tip apex, typically 48-52mm in normal occlusion; VME exceeds 52-58mm). Short Upper Lip (15%): Inadequate vermillion coverage of anterior teeth during smiling—lip length insufficient (normally 22-24mm) to cover gingival margins during smile. The lip elevation amount during smile averages 7-8mm; short lips elevate excessively relative to lip length, exposing gingiva. Hypermobile Lip (35%): Excessive upper lip elevation during smiling—averaging >8mm vertical movement instead of typical 7-8mm. The levator labii superioris and associated muscles contract excessively, creating excessive gingival display despite normal lip length, tooth position, and skeletal anatomy. This most common etiology requires different treatment approach (muscle relaxation via Botox rather than osseous surgery). Combined Factors: Many gummy smile patients demonstrate multiple contributing factors—altered passive eruption with short lip, or VME with hypermobile lip. Treatment planning must address all identified contributors for optimal outcomes.> Key Takeaway: If you show too much gum when you smile, you might be bothered by what's called a "gummy smile." This affects about 1 in 10 people, and for many, it's their biggest aesthetic concern.