Gum recession happens when the gum tissue that hugs your teeth gradually pulls back, exposing more of the tooth or even the root surface underneath. It’s one of the most common dental problems in adults, and it rarely has a single cause. Most cases result from some combination of gum disease, brushing habits, genetics, and hormonal changes working together over time.
Gum Disease Is the Leading Cause
Periodontal disease, the chronic bacterial infection of gum tissue and the bone supporting your teeth, is the biggest driver of recession. When plaque and tartar build up along and below the gumline, they trigger an inflammatory response. Over time, that inflammation breaks down the attachment between gum and tooth, and the tissue pulls away. National survey data from the CDC shows how common this is: about 30% of adults aged 30 to 44 have some form of periodontitis, rising to 46% in adults 45 to 64 and nearly 60% in those 65 and older. Most of these cases are mild or moderate, but even early-stage gum disease can cause noticeable recession if it goes untreated.
The tricky part is that gum disease is often painless in its early stages. You might notice bleeding when you floss, slightly swollen gums, or persistent bad breath before you ever see the gumline shifting. By the time recession is visible, the disease process may have been active for months or years.
You Might Be Brushing Too Hard
Aggressive brushing is one of the most common non-disease causes of recession, and it catches a lot of people off guard. If you’re pressing hard with a medium or stiff-bristled brush, you can physically wear away gum tissue over time. Research on brushing force shows a clear pattern: people who brushed with around 3.8 newtons of force developed severe recession, while those using about 2.1 newtons had none. For context, most people naturally brush at about 2.3 newtons, which puts a lot of us right in the borderline zone.
Bristle stiffness matters too. Hard-bristled brushes produce more damage to tooth surfaces and gums than soft ones at the same pressure. Medium-hard bristles are associated with small tears in the gum tissue called gingival fissures. Systematic reviews have found that soft and extra-soft bristles are the safest choice. If you’re seeing recession on the outer surfaces of teeth (especially canines and premolars, which tend to get the most scrubbing pressure), your technique is a likely contributor.
Genetics and Tissue Thickness
Some people are simply born with thinner gum tissue. If your gums are naturally thin or your jawbone is narrow in certain areas, there’s less of a buffer before the root becomes exposed. This genetic predisposition means recession can happen even in people with excellent oral hygiene. It’s one reason you might notice your gums pulling back on a single tooth that’s slightly out of alignment while the rest of your mouth looks fine. Teeth that sit further forward in the arch or are rotated put extra strain on the thin layer of bone and tissue covering the root side.
Hormonal Changes and Gum Vulnerability
Hormonal shifts at different life stages change how your gum tissue responds to bacteria and inflammation. During pregnancy, rising levels of estrogen and progesterone amplify inflammatory responses to plaque, which is why pregnancy gingivitis is so common. The increased blood flow to gum tissue during pregnancy can actually support tissue repair in the short term, but chronic inflammation during this period can still contribute to attachment loss.
Menopause creates the opposite problem. Declining estrogen leads to thinning of gum tissue, reduced collagen production, and loss of bone density in the jaw. Postmenopausal women show higher rates of periodontal disease and greater bone loss around teeth, making recession more likely to progress. If you’ve noticed your gums changing during or after menopause, the hormonal shift is a real factor, not just coincidence.
Other Contributing Factors
Several other things can set the stage for recession or speed it up:
- Tobacco use. Smoking and chewing tobacco both damage gum tissue and reduce blood flow, impairing the tissue’s ability to heal and fight infection.
- Oral piercings. Lip and tongue piercings can rub against the gums repeatedly, wearing away tissue on the inner surfaces of the lower front teeth especially.
- Tooth misalignment. Crowded or crooked teeth create uneven forces during chewing and make certain areas harder to clean, both of which increase recession risk.
- Clenching or grinding. Chronic pressure on teeth can stress the bone and gum attachment, particularly if you grind at night without a mouthguard.
What Happens When the Root Is Exposed
The visible part of your tooth is covered in enamel, the hardest substance in your body. But below the gumline, the root is covered by a much thinner, softer layer called cementum. When gums recede, that cementum is exposed to your mouth environment, and it can wear away quickly from brushing, acidic foods, or everyday use. Once it’s gone, the underlying layer of the tooth is exposed, and this layer contains thousands of microscopic tubes that connect directly to the nerve inside the tooth.
This is why recession so often comes with sensitivity. Cold drinks, hot food, sweet or acidic things, even a blast of cold air can trigger a sharp, sudden pain. The sensation happens because fluid inside those tiny tubes shifts when temperature or pressure changes, stimulating the nerve. Not everyone with recession gets sensitivity (the tubes can become naturally blocked over time), but it’s one of the most common complaints.
Beyond sensitivity, exposed roots are significantly more vulnerable to cavities. Multiple large studies have consistently found a direct correlation between the amount of recession and the likelihood of developing root-surface cavities. Root cavities can be harder to treat and more likely to threaten the tooth’s long-term survival than cavities on the crown.
How Recession Is Classified
Dentists grade recession on a four-level scale that helps predict what can be done about it. In the mildest cases (Class I and II), the recession hasn’t caused bone or tissue loss between the teeth, and surgical repair tends to work well. In more advanced cases (Class III and IV), the bone and tissue between teeth have also broken down, and full coverage of the exposed root becomes much harder or impossible to achieve surgically. The earlier recession is caught, the more options you have.
Treatment Options
Mild recession that isn’t progressing may not need any surgical treatment. Switching to a soft-bristled brush, adjusting your technique, and keeping up with professional cleanings can stabilize things. If sensitivity is the main issue, desensitizing toothpastes or in-office treatments can block the exposed tubes on the root surface and reduce discomfort.
For more significant recession, gum grafting is the standard surgical approach. The procedure involves taking a small piece of tissue, typically from the roof of your mouth or from a tissue bank, and attaching it over the exposed root. Recovery generally takes one to two weeks, though it can run longer depending on how many teeth are treated. During that time, you’ll eat soft foods and avoid brushing the grafted area directly. The success rate for Class I and II defects is high, with the grafted tissue integrating and providing stable, long-term coverage.
When gum disease is the underlying cause, treating the infection comes first. Deep cleaning below the gumline removes the bacterial deposits driving the inflammation. Without addressing the disease, any graft or repair is likely to fail because the same destructive process will continue undermining the new tissue.