Roughly 1 in 2 adults worldwide have some form of gum disease, making it one of the most common chronic conditions on the planet. Severe periodontitis alone affects over 1 billion people globally, according to the World Health Organization. In the United States, about 4 in 10 adults aged 30 and older have mild, moderate, or severe periodontitis.
U.S. Numbers at a Glance
CDC surveillance data from the National Health and Nutrition Examination Survey puts the number at roughly 65 million American adults with periodontitis. That breaks down by severity: about 30% of adults 30 and older have moderate disease, 8.7% have mild disease, and 8.5% have severe periodontitis. Moderate cases are by far the most common, outnumbering mild and severe combined.
These figures only capture periodontitis, the stage where gum tissue and bone are actively breaking down. They don’t include gingivitis, the earlier, reversible stage of gum inflammation that affects an even larger share of the population. If gingivitis were included, the total number of Americans with some form of gum disease would be substantially higher.
Age Makes a Major Difference
Periodontal disease becomes dramatically more common with age. Among adults 65 and older, about two-thirds have periodontitis. Nearly half of older adults have pockets of infection deep enough to indicate active, progressing disease. This isn’t simply because gums deteriorate with time. Decades of plaque buildup, medication side effects that reduce saliva, and chronic conditions like diabetes all compound the risk.
By contrast, younger adults in their 30s have much lower rates, though the disease is far from rare in that group. The takeaway: periodontal disease accumulates over a lifetime, and the window for prevention is widest when you’re younger.
Men Are Affected More Than Women
About 1 in 2 men aged 30 and older have some level of periodontitis, compared to roughly 1 in 3 women. The gap isn’t driven by biology so much as behavior. Studies consistently find that men have worse oral hygiene habits on average, which accounts for most of the difference in gum health. Hormonal changes during pregnancy and menopause do affect women’s gum tissue, but overall, men carry a higher burden of disease.
Racial and Ethnic Disparities
Periodontal disease does not affect all communities equally. Among adults aged 45 to 64, about 60% of non-Hispanic Black adults and 59% of Hispanic adults had moderate or severe periodontitis, compared to 39% of non-Hispanic white adults. The gap persists into older age: among those 65 to 74, 74% of Hispanic adults had periodontitis versus 53% of non-Hispanic white adults.
These disparities reflect differences in access to dental care, insurance coverage, and exposure to other risk factors rather than inherent biological differences. Communities with less access to preventive dental visits tend to have higher rates of advanced disease by the time it’s diagnosed.
Smoking and Diabetes Amplify Risk
Smokers have twice the risk of developing gum disease compared to nonsmokers. Smoking reduces blood flow to the gums, weakens immune defenses in the mouth, and makes existing infections harder to treat. Quitting doesn’t reverse damage already done, but it does slow progression and improve the odds that treatment will work.
Diabetes is the other major amplifier. People with diabetes are three times more likely to develop periodontal disease, and the relationship runs both ways. Inflamed, infected gums make blood sugar harder to control, and poorly controlled blood sugar makes gum infections worse. About half of adults worldwide have some form of gum disease, but among people with diabetes, the rate climbs significantly higher.
Why the Numbers Are Likely Undercounted
The most reliable U.S. data comes from NHANES surveys conducted between 2009 and 2014. These studies used clinical exams with probing measurements at specific sites in the mouth, which means milder cases or disease in areas that weren’t measured could be missed. People who had already lost all their teeth to gum disease weren’t counted either, since the surveys only examined people who still had teeth.
There’s also the problem of people who never see a dentist. Periodontal disease is painless in its early and moderate stages, so millions of people have it without knowing. The CDC’s estimate of 65 million affected adults is based on a representative sample, but it likely underestimates the true burden because the most severe cases, those in populations with the least access to care, are the hardest to capture in surveys.