Gum recession happens when the gum tissue surrounding your teeth pulls back or wears away, exposing more of the tooth or its root. It’s remarkably common: an estimated 81% of adults have at least 1 mm of recession on one or more teeth, and about 48% have recession of 3 mm or more. The causes range from brushing too hard to bacterial infection to hormonal shifts, and most people have more than one factor working against them at the same time.
Gum Disease Is the Leading Cause
Chronic gum disease, known as periodontitis, is the most significant driver of gum recession. It starts when certain bacteria colonize the pockets between your teeth and gums. One species in particular acts as a “keystone pathogen,” meaning it doesn’t need to be present in large numbers to cause problems. Instead, it disrupts the normal balance of bacteria in your mouth, tipping the microbial community toward one that triggers inflammation.
Once that inflammation takes hold, your immune system responds by releasing signaling molecules that were designed to fight infection but end up damaging your own tissue in the process. These signals activate cells called osteoclasts, which break down bone. Normally, your body keeps bone-building and bone-destroying cells in balance. But the bacteria responsible for gum disease produce enzymes (called gingipains) that degrade your body’s natural brake on bone destruction. The result is a one-sided process: bone around the teeth gets broken down faster than it can be rebuilt. As the supporting bone shrinks, the gum tissue that sits on top of it recedes with it.
This doesn’t happen overnight. Periodontitis is a slow process that can progress for years without obvious pain. Bleeding when you brush or floss, persistent bad breath, and gums that look puffy or dark red are early signs that the bacterial balance in your mouth has shifted.
Brushing Too Hard Wears Gums Away
Aggressive toothbrushing is one of the most common mechanical causes of recession, and it affects people who think they’re taking good care of their teeth. Research on brushing force shows a clear threshold: people who brush at roughly 2.1 newtons of force tend to have no recession, while those pushing closer to 3.8 newtons develop severe recession. For reference, the average person brushes at about 2.3 newtons, which means many people are close to the safe limit without realizing it.
Force isn’t the only factor. The back-and-forth “scrubbing” technique most people default to concentrates wear along the gum line, creating localized damage right where the gum meets the tooth. A rolling motion distributes abrasion more evenly across the tooth surface and is gentler on the gums. Pairing a hard-bristled brush with a highly abrasive toothpaste makes the problem worse. Soft bristles, gentle pressure, and two to three minutes of total brushing time (about 30 seconds per quadrant) are enough to clean effectively without grinding your gums down.
Teeth Grinding and Bite Problems
When your teeth don’t come together evenly, certain teeth absorb more force than they should during chewing or clenching. Over time, that excess pressure stresses the bone and soft tissue supporting those teeth. One study found that gum recession appeared on the front surface of lower front teeth in 85% of cases where the bite lacked proper guidance during jaw movements. Essentially, when specific teeth bear the brunt of contact instead of distributing force across the arch, the tissue around them breaks down.
Teeth grinding (bruxism), whether during the day or while sleeping, amplifies this effect. The repetitive, heavy force flexes the tooth slightly in its socket, which can cause microscopic damage at the gum line. If you wake up with jaw soreness, notice flat or chipped tooth surfaces, or catch yourself clenching during the day, these are signs your bite may be contributing to recession.
Thin Gums Are More Vulnerable
Not everyone starts with the same amount of gum tissue. Gum thickness varies from person to person, and this is largely determined by genetics. A “thin” gum phenotype, defined as tissue less than 1 mm thick, is associated with a higher risk of bone loss and recession. People with thicker gums tend to also have a wider band of firm, attached tissue around each tooth, which acts as a buffer against mechanical and bacterial damage.
You can’t change your gum phenotype, but knowing you have thin tissue helps explain why recession might develop even when your oral hygiene is solid. It also means you need to be more careful with brushing force and more vigilant about early signs of gum disease, since you have less tissue to lose before roots become exposed.
Hormonal Changes in Women
Fluctuations in estrogen and progesterone directly affect gum tissue. During pregnancy, rising levels of both hormones increase blood flow to the gums and amplify the inflammatory response to plaque. Somewhere between 35% and 100% of pregnant women develop pregnancy gingivitis, characterized by swelling, bleeding, and tenderness. Progesterone also interferes with collagen maintenance in the gums, weakening the tissue’s structural integrity. While pregnancy gingivitis itself is usually temporary, repeated episodes of inflammation can contribute to lasting tissue loss.
Menopause creates the opposite hormonal environment but poses its own risks. The steep drop in estrogen can lead to dry mouth, which removes one of your body’s natural defenses against bacterial buildup. More significantly, declining estrogen accelerates bone loss throughout the body, including the jawbone that supports your teeth. This bone loss speeds up any existing gum disease and makes it harder for tissue to heal after injury or infection.
During the premenopausal years, monthly hormonal swings can also make gums more reactive to plaque and local irritants, even in women with otherwise good oral health.
Orthodontic Treatment
Braces and aligners move teeth by remodeling the bone around them, which raises a reasonable concern about recession. The data, however, is reassuring. Only about 5.8% of teeth show recession at the end of active orthodontic treatment, and just 0.6% have recession greater than 1 mm. After the retention phase (when teeth are held in their new positions), about 42% of teeth show some degree of recession, but the severity remains limited, with only 7% exceeding 1 mm.
Interestingly, the degree to which lower front teeth are tilted forward during treatment doesn’t correlate with recession afterward. Wider expansion of the upper arch does slightly increase the risk, but the effect is minimal. Orthodontic treatment on its own is not considered a major risk factor. The bigger concern is when orthodontics is performed on someone who already has thin gums or active gum disease.
Other Contributing Factors
Tobacco use restricts blood flow to the gums, impairing their ability to heal and fight infection. Smokers consistently show more recession than nonsmokers, and the tissue damage from smoking can mask early warning signs like bleeding, since reduced blood flow means inflamed gums may not bleed the way they normally would.
Lip and tongue piercings can cause recession on the teeth they repeatedly contact. A metal barbell rubbing against the inside of the lower front teeth, for example, can wear away gum tissue over months or years. Misaligned or crowded teeth create areas that are harder to clean, allowing plaque to accumulate in spots where brushing and flossing can’t reach effectively. Even the position of a tooth within the jawbone matters: a tooth that sits slightly outside the arch has less bone covering its front surface, making the overlying gum more prone to recession.
How Recession Is Treated
Treatment depends on the severity and the cause. Mild recession that isn’t progressing may only need monitoring and adjustments to brushing habits. When recession is significant enough to cause sensitivity, cosmetic concern, or risk of further tissue loss, surgical grafting is the standard approach.
The most common procedure uses connective tissue taken from the roof of your mouth and placed over the exposed root, then covered by repositioning the surrounding gum tissue. This technique achieves 70% to 86% root coverage and tends to produce a natural color match with the surrounding gums. Recovery involves some discomfort, but it’s generally less than patients expect.
A free gingival graft takes a thicker piece of tissue from the palate and attaches it directly to the recession site. It’s highly predictable for building up a band of sturdy, attached gum tissue and stopping recession from getting worse, but root coverage is less consistent (41% to 76%). The grafted tissue can also look slightly different in color from the surrounding gums, so this approach is typically reserved for areas that aren’t visible when you smile.
Neither procedure is a permanent fix if the underlying cause isn’t addressed. Recession driven by aggressive brushing will return if habits don’t change. Recession caused by gum disease will progress unless the bacterial infection is controlled. Identifying and treating the root cause is just as important as the graft itself.