Gingival recession happens when the gum tissue pulls back from the tooth, exposing more of the root surface. More than 50 percent of adults have at least one site with recession of 1 mm or more, and that number climbs to 88 percent in people 65 and older. It’s rarely caused by a single factor. Most cases involve a combination of mechanical damage, anatomy, disease, and lifestyle habits working together over time.
Brushing Too Hard or Too Often
Aggressive toothbrushing is one of the most common mechanical causes. Brushing with too much pressure, using hard bristles, or scrubbing back and forth rather than using gentle circular motions gradually wears away both enamel and gum tissue. The damage tends to be worse on the side opposite your dominant hand, since that’s where most people apply more force. Frequency and duration matter too: brushing three or more times a day with a stiff-bristled brush compounds the problem over months and years.
Abrasive toothpastes, especially whitening formulas with gritty particles, can accelerate the process. The combination of a hard brush, heavy pressure, and an abrasive paste is particularly destructive. Switching to a soft-bristled brush and using light pressure (just enough to feel the bristles flex) can stop mechanical recession from progressing further.
Gum Disease and Plaque Buildup
Periodontal disease is the other major driver. When bacterial plaque accumulates along the gumline, it triggers chronic inflammation. Over time, that inflammation breaks down the connective tissue fibers that attach your gums to the tooth and erodes the underlying bone. As the bone recedes, the gum follows. Unlike brushing-related recession, which usually affects one or two teeth at a time, periodontitis-driven recession often shows up across multiple teeth and is accompanied by deeper pockets between the gum and the tooth.
Even mild, long-standing gingivitis (gum inflammation without bone loss) can contribute if left untreated for years. The tissue becomes chronically swollen, then gradually breaks down and shrinks. Regular removal of plaque and tartar is the most effective way to prevent this progression.
Thin Gums and Bone Structure
Not everyone starts with the same amount of protective tissue. People with a thin gingival biotype, meaning their gum tissue is naturally narrow and delicate rather than thick and fibrous, are significantly more prone to recession. Thin tissue is easier to damage from brushing trauma, and it breaks down faster in the presence of even mild inflammation from plaque.
The bone underneath matters just as much. Some people have naturally thin or missing patches of bone over the roots of certain teeth, called dehiscences and fenestrations. Without that bony support, the overlying gum has nothing to hold it in place. These bone defects are especially common when teeth are crowded or positioned outside the normal arch. A tooth that sits too far forward or too far back in the jawbone is more likely to have thin bone on one side, which predisposes it to recession.
Frenal attachments play a role too. The frenum is the small band of tissue connecting your lip or cheek to the gum. When it attaches too close to the gum margin, it can pull the tissue away from the tooth during normal lip and cheek movement. The risk increases when a high frenal attachment is combined with a shallow vestibule (the space between your cheek and gum) and a minimal band of thick, protective tissue around the tooth.
Clenching, Grinding, and Bite Problems
Excessive force on teeth doesn’t just wear down enamel. Clenching and grinding (bruxism) generate abnormal loads that transmit through the tooth to the surrounding bone and gum. Over time, this occlusal stress can contribute to bone loss around specific teeth, and recession follows. The effect is most noticeable on teeth that bear the brunt of an uneven bite, such as teeth that hit first when you close your jaw or individual teeth that absorb lateral forces during grinding.
Tobacco and Reduced Blood Flow
Smoking is one of the strongest lifestyle risk factors for gum recession. Nicotine triggers the release of stress hormones that constrict blood vessels in the gum tissue, reducing blood flow. It also suppresses the production of nitric oxide, a molecule that normally keeps blood vessels relaxed and open. The result is chronically starved tissue that heals poorly and breaks down more easily.
Chronic smokers have smaller capillary diameters in their gums and less overall blood perfusion, even though the body attempts to compensate by growing more (but less functional) blood vessels. One telling finding: in healthy regular smokers, gingival blood flow increases significantly within just three days of quitting and continues to improve over the following eight weeks. This confirms that smoking actively suppresses the blood supply your gums need to stay healthy. The reduced blood flow also masks the warning signs of gum disease, since inflamed gums bleed less in smokers, making the problem easier to miss until recession is already underway.
Orthodontic Treatment
Moving teeth with braces or aligners can contribute to recession, though the risk during active treatment is relatively low. Only about 5.8 percent of teeth show recession at the end of orthodontic treatment, and just 0.6 percent have recession greater than 1 mm. The bigger concern comes later: after the retention period, 41.7 percent of teeth show some degree of recession, though severity remains limited, with only 7 percent exceeding 1 mm.
The mechanism is straightforward. When a tooth is moved outside the envelope of bone, particularly when pushed forward (toward the lip), the bone and gum on that side thin out. Teeth that were severely crowded before treatment and had to be moved significant distances are at highest risk. People with a thin gingival biotype going into orthodontic treatment face a compounded risk, since they have less tissue margin to begin with.
Age and Other Contributing Factors
Recession increases steadily with age. While about half of adults between 18 and 64 have at least one affected site, that prevalence jumps to 88 percent in people 65 and older. Some of this is simply cumulative exposure to all the factors above: decades of brushing, years of subclinical inflammation, gradual bone changes. But aging itself brings tissue changes, including reduced collagen production and slower cellular turnover, that make gums more vulnerable.
Piercings on the lip or tongue can cause localized recession on nearby teeth through repeated friction. Poorly fitting partial dentures or dental restorations that impinge on the gum margin have a similar effect. Even habits like holding objects between your teeth (bobby pins, pen caps) can traumatize a specific spot over time.
How Recession Severity Is Classified
Dentists now classify recession using the Cairo system, which focuses on how much attachment has been lost between teeth (the interproximal area) rather than just how far the gum has pulled back on the front surface. In the mildest form (RT1), there’s no attachment loss between the teeth, and surgical repair has the highest chance of full root coverage. In RT2, some interproximal attachment is lost but not more than the loss on the front of the tooth. In RT3, the interproximal loss exceeds the front-surface loss, which signals more advanced disease and makes complete coverage harder to achieve.
This classification matters because it predicts how well treatment will work. Connective tissue grafting, the most common surgical repair, achieves an average of 93 percent root coverage on upper teeth and 76 percent on lower teeth. Complete root coverage (getting the gum all the way back to its original position) happens in about 76 percent of upper-jaw sites and 57 percent of lower-jaw sites. Results depend heavily on the starting severity: RT1 cases respond best, while RT3 cases have more limited outcomes.