What Causes a Gummy Smile?

A "gummy smile" — where an unusually large band of gum tissue shows above the upper teeth when smiling — is one of the most common cosmetic concerns people bring to dentists, orthodontists, and periodontists. It isn't a health problem in most cases, but it can affect confidence, and the right fix depends heavily on why the excess gum is showing in the first place.

 

There's no single "best" treatment. The right approach depends on the underlying cause, how much correction is needed, and how permanent a solution someone wants. Below is a look at three of the most common treatment paths — orthodontics, Botox, and gingival resection — along with how they compare.

 

What Causes a Gummy Smile?

Before choosing a treatment, it helps to identify the cause, since different causes call for different fixes:

 

• Excessive gum tissue (altered passive eruption): The gums simply haven't receded fully to reveal the natural crown of the tooth, so teeth look shorter than they are.

• Vertical maxillary excess: The upper jawbone has grown longer than average, pushing the gumline and teeth down.

• A hyperactive upper lip: The muscles that lift the upper lip (particularly the levator labii superioris) pull it higher than average when smiling.

• Worn or short teeth: When teeth are shorter due to wear or genetics, the ratio of gum-to-tooth can look disproportionate even if gum position is normal.

• Dental compensation from bite issues: Some malocclusions cause the front teeth and surrounding gum to sit lower than ideal.

 

A dental professional typically diagnoses the cause through a clinical exam, photos of the smile at rest and at full smile, and sometimes imaging like a cephalometric X-ray. Bellevue Wellness Dental offers this kind of evaluation in-house and can diagnose the underlying cause of a gummy smile before recommending a treatment path.

 

Option 1: Orthodontics

• Best for: Gummy smiles caused by bite issues, tooth positioning, or mild-to-moderate vertical maxillary excess.

 

Braces or clear aligners can intrude (move upward) the upper front teeth, which reduces how much gum tissue is visible when smiling. In cases where the entire upper jaw is involved, orthodontics is sometimes combined with a temporary anchorage device (TAD) — a small, temporary implant that gives braces extra leverage to move teeth or intrude tooth segments more predictably.

 

Pros:

• Addresses the underlying tooth position or bite issue, not just the appearance

• Can improve overall function and long-term dental health

• Non-surgical option (in cases where TADs, not jaw surgery, are used)

 

Cons:

• Takes months to a couple of years to complete

• Less effective for cases driven by muscle activity or true jaw skeletal excess

• More involved and costly than a quick cosmetic fix

 

Option 2: Botox (Neuromodulator Injections)

• Best for: Gummy smiles caused by a hyperactive or overactive upper lip.

 

Small injections of botulinum toxin into the muscles that elevate the upper lip (commonly the levator labii superioris and related muscles) temporarily weaken their pull. This limits how high the lip rises during a smile, reducing gum exposure without touching the teeth or bone at all.

 

Pros:

• Quick, in-office procedure with minimal downtime

• Non-surgical and reversible

• Immediate improvement, generally visible within a few days

 

Cons:

• Temporary — effects typically last 3 to 6 months and require repeat treatment

• Only effective when a hyperactive lip is the actual cause; won't help with excess gum tissue or jaw-related cases

• Requires a practitioner experienced in facial anatomy to avoid an asymmetric or "frozen" smile

 

Option 3: Gingival Resection (Gum Contouring / Crown Lengthening)

• Best for: Gummy smiles caused by excess gum tissue covering more of the tooth than necessary.

 

This is a minor surgical procedure, sometimes called gum contouring or crown lengthening, in which a periodontist or dentist removes excess gum tissue (and occasionally reshapes a small amount of underlying bone) to expose more of the natural tooth. It's often done with a scalpel, laser, or radiosurgery unit.

 

Pros:

• Permanent, one-time correction in most cases

• Directly reveals more of the natural tooth structure

• Can often be done in a single office visit under local anesthesia

 

Cons:

• Involves a surgical recovery period (typically about 1–2 weeks of gum healing)

• Not effective if the cause is muscle activity or jaw position rather than tissue

• Requires a skilled clinician to keep gum contours symmetrical and natural-looking

 

Comparing the Three at a Glance

• Orthodontics Botox Gingival Resection

-- Best for Tooth position, bite-related cases Hyperactive lip Excess gum tissue

 

• Invasiveness Non-surgical (may use TADs) Non-surgical Minor surgery

-- Permanence Long-term/permanent Temporary (3–6 months) Permanent

 

• Timeline Months to years Days Single visit + healing

-- Recovery None to minimal None 1–2 weeks

 

Can These Be Combined?

Yes — many patients have more than one contributing cause, and combination treatment is common. For example, someone might have both excess gum tissue and a slightly overactive lip, in which case a periodontist and a provider offering Botox might collaborate. Complex cases involving true jaw skeletal excess may also involve orthognathic (jaw) surgery, which is a more significant undertaking than any of the three options above.

 

Getting an Accurate Diagnosis

Because the same visual concern — too much gum showing — can stem from entirely different causes, the most important first step is a proper evaluation rather than jumping straight to a treatment. A consultation with a periodontist, orthodontist, or cosmetic dentist who regularly treats gummy smiles can help pinpoint the cause and map out whether a conservative option like Botox, a longer-term fix like orthodontics, or a permanent option like gingival resection makes the most sense.

 

Bellevue Wellness Dental offers diagnosis and treatment for gummy smiles under one roof, including orthodontic options, Botox for lip hyperactivity, and gingival resection/contouring — making it possible to get evaluated and start treatment without bouncing between multiple specialists.