I recently met a patient who covered their mouth every time they laughed. Their teeth were healthy, but they felt self-conscious because too much gum showed when they smiled.
It’s a concern I hear often in my practice. The first question patients usually ask is, “Can a gummy smile be fixed?” The answer is yes, but the right treatment depends entirely on why your gums show when you smile.
That’s why I never recommend a treatment before making a diagnosis. What works for one patient may not work for another.
In this guide, I’ll explain what a gummy smile is, what causes it, how I diagnose it, and which treatments actually work.
What Is a Gummy Smile?
A gummy smile, medically known as excessive gingival display, means more gum tissue is visible above the upper teeth than is generally considered balanced.
Although every smile is unique, these guidelines are commonly used:
| Gum Display When Smiling | Typical Interpretation |
| 1–2 mm | Normal smile |
| 3 mm | Mild gummy smile |
| 4 mm or more | Excessive gingival display |
A gummy smile isn’t a disease or dental problem by itself. In most cases, it’s simply an aesthetic concern. But if it makes you avoid smiling, cover your mouth in photos, or feel less confident, it’s worth having it evaluated.
What Causes a Gummy Smile?
One of the biggest misconceptions I hear is that every gummy smile has the same cause.
It doesn’t.
Several different conditions can create the same appearance, which is exactly why diagnosis comes first:
| Cause | What Happens | Common Treatment |
| Altered passive eruption | Teeth remain partially covered by gum tissue | Gum contouring or crown lengthening |
| Hypermobile upper lip | Lip lifts higher than normal while smiling | Botox or lip repositioning |
| Short upper lip | Naturally exposes more gum tissue | Lip repositioning surgery |
| Excess gum tissue | Gums cover more of the teeth than normal | Gingivectomy or laser contouring |
| Small or worn teeth | Teeth appear shorter than they actually are | Veneers or crowns |
| Vertical maxillary excess | The upper jaw developed longer than normal | Orthodontics with jaw surgery |
Altered passive eruption follows the same underlying pattern as impacted teeth: teeth that never fully erupted the way they should.
Most of these causes are genetic or related to how your teeth, lips, and jaw developed. They’re not something you caused, and outside of hygiene-related gum overgrowth, not something you could have prevented.
Is a Gummy Smile Normal?
Yes.
Showing a small amount of gum when you smile is completely normal. Many attractive smiles naturally display 1 to 2 millimeters of gum tissue. Clinical studies estimate that noticeable gummy smiles show up in around 10% of adults between 20 and 30, more often in women than men.
The concern usually starts at 3 to 4 millimeters or more, especially if it makes the teeth look short or out of proportion.
Ultimately, the decision to seek treatment isn’t based on a measurement. It’s based on how you feel about your smile. Plenty of patients have some extra gum display and never think twice about it. If it bothers you, that’s reason enough to look into treatment. If it doesn’t, there’s no medical reason to intervene.
How Do Orthodontists Diagnose a Gummy Smile?
This is the most important part of the process. Two people can have very similar-looking smiles but need completely different treatments.
During your consultation, I evaluate:
- Upper lip position at rest and while smiling
- Tooth size and proportions
- Gum thickness and overall gum health
- Bite relationship and jaw position
- Facial balance and smile symmetry
By the end of the exam, I can usually tell whether the problem is coming from the gums, teeth, lips, jaw, or a combination of several factors. That diagnosis guides every treatment recommendation I make.
How to Fix a Gummy Smile: Treatment Options That Actually Work
There’s no single solution that works for everyone. The best treatment depends entirely on the underlying cause, so instead of a generic list, here’s how each option matches up to the specific cause it treats:
1. Braces or Invisalign
Best for
- Gummy smiles caused by tooth position
- Mild bite problems
If the gummy smile is caused by tooth position or a mild bite problem, braces or Invisalign can reposition the teeth to reduce visible gum tissue. For more complex cases, I may use temporary anchorage devices (TADs) to move teeth more precisely without surgery.
However, orthodontic treatment on its own won’t correct excess gum tissue, excessive lip movement, or an overgrown upper jaw.
2. Jaw Surgery
Best for
- Vertical maxillary excess (an overgrown upper jaw)
Orthodontic treatment alone isn’t enough to correct jaw overgrowth. An oral surgeon repositions the upper jaw, typically paired with roughly a year of orthodontic treatment before and after. It’s the biggest commitment on this list, but for the right diagnosis, it’s also the most complete fix.
3. Veneers or Crowns
Best for
- Naturally short teeth
- Teeth worn down over time
If your teeth are genuinely shorter than they should be, whether from wear or genetics, veneers or crowns can lengthen them and rebalance the tooth-to-gum ratio without touching the gums or jaw at all.
4. Gingivectomy or Laser Gum Contouring
Best for
- Excess gum tissue covering the teeth
A periodontist can reshape or remove the extra tissue to reveal more of the natural tooth, either through a traditional gingivectomy or laser gum contouring, which is less invasive and typically has a faster recovery.
Research on esthetic crown lengthening published in the National Library of Medicine backs this up as a safe, accurate way to correct gum-related causes of a gummy smile.
This is also the one cause worth mentioning that can overlap with gum health, since inflamed or overgrown tissue is sometimes linked to plaque buildup and gum disease. Keeping up with daily brushing and flossing is worth doing regardless of which treatment you end up needing.
5. Botox or Lip Repositioning
Best for
- A short upper lip
- A hypermobile upper lip
A periodontist or oral surgeon can perform lip repositioning surgery to limit how high the lip rises during a smile. Botox is the lower-commitment option, relaxing the lip muscle for a similar effect.
A systematic review indexed in PubMed found that the effect generally holds for 8 to 12 weeks before gradually fading, which aligns with the 3 to 4 months I typically tell patients to expect before a repeat treatment.
Which Treatment Is Right for You?
The right treatment starts with the right diagnosis. I’ve seen patients with similar-looking gummy smiles who needed completely different solutions because the underlying cause wasn’t the same.
During your consultation, I’ll determine whether the issue is coming from your teeth, gums, lips, or jaw, then recommend the treatment that’s actually right for you, whether that’s orthodontics, a referral to a specialist, or a combination of both.
Ziehmer Orthodontics also offers in-office teeth whitening options, so if a brighter smile is part of what you’re after, ask Dr. Ziehmer and our team during your visit which option would work best for you.
Final Thoughts
A gummy smile has many possible causes and just as many possible fixes. That’s exactly why I don’t recommend guessing at a solution before getting a real diagnosis. Get the diagnosis wrong, and you don’t just waste money; you leave the actual cause untouched.
If your smile has been bothering you, I’d rather take the time to figure out exactly what’s driving it than have you spend money on something that was never going to solve it. At Ziehmer Orthodontics, that evaluation is where every gummy smile conversation starts.
Frequently Asked Questions
How much gum showing is considered a “gummy smile”?
Most clinical definitions put normal gingival display at 1 to 2 millimeters, with 3 to 4 millimeters or more generally considered excessive. What matters most is whether it bothers you.
Can braces alone fix a gummy smile?
Sometimes, if the cause is tooth position or a mild bite issue. More significant causes, like jaw overgrowth or excess gum tissue, need a different approach.
Is a gummy smile caused by poor oral hygiene?
Not usually. Most cases come from genetics, tooth eruption, lip anatomy, or jaw development. The exception is gum tissue that’s enlarged from inflammation or plaque buildup.
What’s the least invasive treatment for a gummy smile?
Botox is the least invasive option, but it only helps when a hypermobile upper lip is the cause, and results are temporary.
