Dental & oral health

Why a Gum Line Looks Uneven and What Helps

Save

A gum line rarely goes uneven for just one reason, and the right response depends heavily on which one is actually happening — brushing too hard on one side of the mouth produces a very different picture than gum disease does, or than orthodontic treatment that moved some teeth more than others. This piece walks through the most common causes and what treatment for each actually involves.

Last updated: July 2026

Talk to a clinician

Gale can help you find a clinician in your state and request a visit.

Find care →

What Actually Makes a Gum Line Look Uneven

A gum line looks uneven for one of a few reasons, and telling them apart matters because the response is different for each. The most common cause is gum recession — the gum tissue pulling back and exposing more of the tooth root on some teeth than others — but active gum inflammation, a naturally uneven amount of gum tissue since the teeth erupted, or shifting caused by orthodontic treatment can all produce the same visual effect from very different underlying causes. A dentist working out which one applies usually starts by asking how long the unevenness has been there and whether it's gotten more noticeable recently, since a gum line that's been stable for years reads very differently than one that's visibly changing.

Gum Recession: The Most Common Cause

Gum recession happens when the gum tissue around a tooth pulls back, exposing more of the root, and it's often traced to aggressive brushing or periodontal disease rather than one single cause 1. Because brushing habits and gum disease don't affect every tooth equally — a person might brush harder on their dominant-hand side, or periodontal disease might be more advanced in one area of the mouth — the recession, and the unevenness it creates, often shows up asymmetrically rather than evenly across the whole gum line. The exposed root surface that comes with recession is also why receded teeth are frequently more sensitive to hot and cold than teeth with healthy gum coverage 2. Working through gum recession causes with a dentist usually starts with a look at brushing technique and toothbrush stiffness, since a hard-bristled brush used with too much pressure is one of the more fixable contributors compared with a genetic tendency toward thin gum tissue in the first place.

How Common Is Gum Disease Behind an Uneven Line?

Periodontal disease is common enough that it's worth ruling out as a cause any time a gum line has changed shape: roughly 42 to 47 percent of U.S. adults age 30 and older have some form of it 3. Because gum disease rarely advances at the same pace around every tooth — it's often worse in spots that are harder to clean, or where plaque has built up unnoticed for longer — an uneven gum line is frequently gum disease showing up asymmetrically rather than gum disease being absent from the smoother-looking areas. Areas between the back teeth, and spots along the gumline that are harder to reach with a toothbrush or floss, are disproportionately represented in that unevenness simply because they're disproportionately represented in where plaque tends to sit undisturbed.

When It's Gingivitis, Not Yet Recession

Gingivitis, the earliest stage of gum disease, causes swelling and puffiness that can make a gum line look uneven without any permanent tissue loss — the gum tissue is inflamed rather than pulled back. Gingivitis is generally reversible: professional cleaning combined with regular brushing and flossing usually eliminates it before it progresses to the more serious, less reversible periodontitis stage 4. Telling the two apart from a mirror alone is difficult, since both can make a gum line look irregular; a dentist typically distinguishes them by gently checking whether the gum tissue is swollen and bleeds easily, which points to inflammation, or whether the root surface is visibly more exposed than it used to be, which points to recession.

If Orthodontic Treatment Changed the Gum Line

Tooth movement, including from clear aligners, can also leave the gum line looking different than it did before treatment, and this has been documented specifically as a risk with direct-to-consumer aligner programs that move teeth without an in-person dentist or orthodontist evaluating the gums first. An analysis of adverse-event reports for direct-to-consumer sequential aligners in the FDA's database found harms including gum recession alongside tooth mobility and open bite 5. A gum line that changed shape during or after aligner treatment is worth having evaluated by a dentist who can tell whether it's recession, inflammation, or simply how the teeth settled into their new position. Traditional braces, done with regular in-person adjustments, carry the same general risk of gum changes during tooth movement, but the ongoing supervision makes it more likely that early irritation gets caught and addressed before it becomes recession.

What Treatment Actually Looks Like

Once gum disease is confirmed as the cause, treatment usually starts with scaling and root planing — a deep cleaning that removes plaque and bacterial toxins from below the gumline and smooths the root surfaces — which is the standard first-line non-surgical treatment, often followed by ongoing maintenance cleanings 6. For recession that's already happened, scaling and root planing can stop it from getting worse, but it doesn't rebuild tissue that's already been lost — that generally requires a separate conversation about gum grafting, which is a different procedure from a routine deep cleaning 1. The question of do receding gums grow back on their own comes up constantly at this point, and the honest answer is no: gum tissue doesn't regenerate the way it might after a minor cut elsewhere on the body, which is exactly why grafting exists as a separate, deliberate procedure rather than something that happens naturally once the underlying cause is treated.

When to See a Dentist About It

An uneven gum line by itself usually isn't an emergency, but it's worth an evaluation rather than waiting to see if it changes on its own, since recession and gum disease both tend to progress rather than resolve without treatment. Worth bringing up: whether the unevenness has gotten more noticeable recently, whether any teeth feel more sensitive than they used to, and whether there's any bleeding when brushing or flossing around the areas that look different.

Common questions

Not always. Some gum-line unevenness is simply natural — how much gum tissue covers each tooth can vary slightly since the teeth first came in. But recession, gingivitis, and periodontitis are the more common causes, and because they don't affect every tooth equally, they often make a gum line look uneven rather than evenly receded.

No. Once gum tissue has pulled back and exposed the root, it doesn't grow back on its own. Treatment like scaling and root planing can stop recession from getting worse, and gum grafting can rebuild lost tissue in more advanced cases, but neither one is the same as the gum tissue naturally returning.

Moving teeth can change how the gum tissue sits around them, and in some cases — particularly with aligner programs that don't include an in-person evaluation of the gums — that shift has been linked to gum recession as a reported side effect. A gum line that changed noticeably during or after orthodontic treatment is worth having a dentist look at directly.

No. Gingivitis is inflammation and swelling of the gum tissue, and it's generally reversible with professional cleaning and better brushing and flossing habits. Gum recession is the tissue actually pulling back and exposing the root, which is a separate, less reversible change. Gingivitis left untreated can eventually contribute to the kind of gum disease that causes recession.

It depends on the cause. If gum disease is behind it, treatment usually starts with scaling and root planing, a deep cleaning below the gumline, followed by regular maintenance visits. If the unevenness is more about how much gum tissue naturally covers each tooth, that's a cosmetic conversation about gum contouring rather than a gum-disease treatment.

Related

Say it back

How would you explain this to someone you love?

Two or three sentences, just as you’d say it. Gale reflects back what you focused on — a mirror, not a quiz.

Talk to a clinician

Gale can help you find a clinician in your state and request a visit.

Find care →

When an Uneven Gum Line Needs Prompt Attention

  • —Gums that bleed easily when brushing or flossing, or that look red and swollen
  • —Gum recession that's visibly progressing over a period of weeks or months
  • —A tooth that feels loose or has shifted position along with the changing gum line

This article is general information about the common causes of an uneven gum line, not a diagnosis. A dentist or periodontist who has examined the gums directly is the only one who can say what's causing a specific case.

References

  1. 1.American Dental Association (JADA For the Patient) (2014). Gingival recession. Journal of the American Dental Association. linkCauses of gum recession including aggressive brushing and periodontal disease, and treatment options such as gum grafting, used to explain why recession creates unevenness and what rebuilding lost tissue involves.
  2. 2.American Dental Association (2024). Sensitive Teeth - Heat and Cold Sensitivity. ADA MouthHealthy. link ✓Exposed roots from gum recession are a cause of tooth sensitivity, used to explain why receded areas of an uneven gum line often feel more sensitive.
  3. 3.National Institute of Dental and Craniofacial Research (2024). Periodontal Disease in Adults (Age 30 or Older). NIDCR (NIH) Data & Statistics. link ✓Prevalence of periodontal disease among US adults 30 and older (roughly 42-47%), used to show how common gum disease is as a cause of an uneven gum line.
  4. 4.American Dental Association (2024). Gingivitis. ADA MouthHealthy. link ✓Gingivitis is the early, reversible stage of gum disease treatable with professional cleaning plus brushing and flossing, used to distinguish inflammation-driven unevenness from recession.
  5. 5.Kunkel T, et al. (2023). Adverse Events Related to Direct-To-Consumer Sequential Aligners - A Study of the MAUDE Database. PubMed Central (peer-reviewed study). link ✓FDA MAUDE database adverse-event reports for direct-to-consumer aligners cataloging gum recession among reported harms, used to explain how orthodontic treatment can change the gum line.
  6. 6.American Academy of Periodontology (2024). Non-Surgical Treatments. American Academy of Periodontology. link ✓Scaling and root planing is the first-line non-surgical treatment for gum disease, used to describe what treatment for a gum-disease-related uneven gum line involves.

6 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — citations link their sources. Editorial policy

← Back to the health library