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 rarely caused by a single factor. Most cases involve some combination of bacterial infection, mechanical damage, genetics, and hormonal or systemic health conditions. Understanding what’s driving your recession is the first step toward slowing or stopping it.
Gum Disease Is the Leading Cause
Periodontal (gum) disease is the most common reason gums recede. It starts when bacterial plaque builds up along and below the gumline. As bacteria spread deeper, they trigger the formation of a periodontal “pocket,” an abnormal deepening of the space between the tooth surface and the gum tissue. Bacteria in these pockets release toxins that intensify inflammation, and over time, this process destroys the connective tissue and bone that hold your teeth in place. That destruction is what pulls the gumline downward.
The early stage, gingivitis, is reversible. Your gums may bleed when you brush or look redder than usual, but the tissue hasn’t been permanently lost. Once it progresses to periodontitis, the damage to bone and soft tissue becomes harder to reverse, and recession accelerates. Smoking, poor oral hygiene, and certain medications that reduce saliva flow all speed this progression.
Brushing Too Hard Wears Tissue Away
Aggressive toothbrushing is one of the most common non-disease causes of recession. The damage is mechanical: forceful scrubbing, hard-bristled brushes, and highly abrasive toothpastes physically wear down both enamel and gum tissue over time. The resulting lesions often appear as wedge-shaped or V-shaped defects at the base of the tooth, right where the gum meets the enamel.
Horizontal brushing, the back-and-forth sawing motion many people default to, is consistently associated with the greatest tissue loss at this vulnerable area. The bristle diameter, the stiffness of the brush, how long you brush, and how much pressure you apply all contribute. Switching to a soft-bristled brush and using gentle, circular strokes can make a meaningful difference if mechanical abrasion is a factor for you.
Teeth Grinding and Clenching
Bruxism, the habit of grinding or clenching your teeth, creates intense forces that stress the bone and tissue around your teeth. These forces concentrate at the gumline, weakening the attachment between tooth and bone. The damage is compounded because most people grind at night and have no idea they’re doing it. Over months and years, the chronic stress thins the bone supporting the tooth and makes the overlying gum tissue more vulnerable to recession.
When bruxism and aggressive brushing happen together, the effect is worse. The grinding loosens the mineral structure at the root surface near the bone crest, and brushing then strips that weakened material away more easily. If you wake up with jaw soreness, headaches, or notice flat, worn spots on your teeth, nighttime grinding may be contributing to your recession.
Thin Gum Tissue and Genetics
Not everyone starts with the same thickness of gum tissue. People with a “thin biotype,” meaning naturally thinner, more delicate gum tissue, are more prone to recession even without aggressive brushing or gum disease. One study of patients without periodontitis found that nearly 74% of sites showing recession had thin gum tissue. While genetics isn’t something you can change, knowing you have thinner tissue helps explain why recession may be happening and signals the need for gentler oral care habits.
Tooth position matters too. If a tooth sits slightly outside the arch of the jawbone, there’s less bone and tissue covering its root on the outer side. This is partly why some teeth recede while their neighbors don’t.
Hormonal Changes in Women
Fluctuations in estrogen and progesterone have a direct effect on gum tissue. During pregnancy, rising levels of both hormones amplify the gum’s inflammatory response to even small amounts of plaque. This heightened sensitivity can lead to pregnancy gingivitis, swollen and bleeding gums that, if persistent, may contribute to tissue breakdown.
Menopause presents the opposite problem. Declining estrogen leads to thinning of the gum tissue, impaired collagen production, and bone loss in the jaw. Reduced saliva production during menopause worsens things further, because saliva helps buffer acids and wash away bacteria. The combination of drier mouth, thinner tissue, and a shift toward a more inflammatory immune profile makes postmenopausal women particularly susceptible to progressive gum disease and recession. Oral contraceptives can also elevate hormone levels enough to shift the bacterial balance in the mouth and increase gum sensitivity.
Diabetes and Systemic Health
Diabetes, especially when blood sugar is poorly controlled, weakens the gums from the inside out. Chronic high blood sugar reduces collagen levels in gum tissue, slows down new collagen production, and speeds up the breakdown of connective tissue. It also triggers a process called glycation, where sugar molecules bind to proteins and form compounds that alter immune cell function. These compounds stimulate the release of inflammatory signals that keep the gums in a prolonged state of inflammation, making it harder for tissue to heal and easier for periodontal disease to progress.
People with uncontrolled diabetes often respond less well to standard gum treatments, because the underlying metabolic disruption continues to undermine tissue integrity even after bacteria are addressed.
Oral Piercings
Lip and tongue piercings are an underappreciated cause of localized recession. The metal jewelry repeatedly contacts the gum tissue on the inside of the mouth, creating chronic irritation. According to the American Academy of Pediatric Dentistry, gum recession shows up in 7 to 50 percent of people with lip piercings and 6 to 44 percent of those with tongue piercings. The wide range reflects differences in jewelry size, placement, and how frequently the wearer plays with the piercing. The recession tends to be limited to the teeth directly behind the jewelry, which makes the cause easier to identify.
Orthodontic Treatment
Braces and clear aligners work by moving teeth through bone, and if a tooth is pushed too far in any direction, it can move outside the boundaries of the jawbone that supports it. When that happens, the bone thins or develops gaps (called fenestrations or dehiscences), and the gum tissue over those areas recedes. This risk is highest in people who already have thin gum tissue and when teeth are moved aggressively in the lip-to-tongue direction. It doesn’t mean orthodontics cause recession in everyone, but it’s a recognized risk that orthodontists monitor, particularly around the lower front teeth where bone is naturally thinnest.
How Recession Is Classified
Dentists categorize recession into three types based on how much attachment has been lost between the teeth. In the mildest form (RT1), the tissue between adjacent teeth is still intact, and full root coverage through treatment is often achievable. In RT2, the tissue loss between teeth matches or is less than the loss on the outer surface, making coverage more challenging. In RT3, the loss between teeth exceeds the loss on the outer surface, which generally means complete root coverage is unlikely. Knowing your classification helps set realistic expectations if you’re considering gum grafting or other corrective procedures.
Recession usually develops slowly, over months or years, so it’s easy to miss until a tooth looks noticeably longer or feels sensitive to cold. Paying attention to changes in your gumline, especially around the lower front teeth and upper canines where recession is most common, helps catch it before significant tissue is lost.