Gum disease is extremely common. About 42% of U.S. adults aged 30 and older have some form of periodontitis, the more advanced stage of gum disease that damages the tissues and bone supporting your teeth. Globally, oral diseases collectively affect roughly 3.5 billion people, making them the most widespread noncommunicable diseases on the planet.
How Many People Have Gum Disease
Data from the National Institute of Dental and Craniofacial Research puts the U.S. prevalence at 42.2% of adults 30 and older. That breaks down into 34.4% with nonsevere periodontitis and 7.8% with severe periodontitis. A separate analysis using CDC and American Academy of Periodontology criteria found a similar overall rate of about 39%, with moderate cases accounting for the largest share at 28.1%, severe cases at 7.3%, and mild cases at 3.5%.
In practical terms, if you’re in a room with ten adults over 30, four of them likely have gum disease right now. Most of those cases are moderate, meaning the damage has progressed beyond early inflammation but hasn’t yet reached the point of loose teeth or significant bone loss. The severe cases, affecting roughly 1 in 13 adults, involve deep pockets of infection and substantial bone destruction that can lead to tooth loss.
Age Makes a Big Difference
Gum disease becomes significantly more common as you get older. Among adults 65 and older, about two-thirds have periodontitis. Nearly 62% of older adults in that age group have at least one site in their mouth where gum tissue has pulled away from the tooth by 5 millimeters or more, a sign of meaningful tissue breakdown. This increase isn’t just about years of wear. Older adults often take medications that reduce saliva flow, have more chronic health conditions that affect healing, and may have difficulty maintaining thorough brushing and flossing routines.
Who Is Most at Risk
Smoking is one of the strongest risk factors. If you smoke, your risk of gum disease is roughly double that of a nonsmoker, and the risk climbs with the number of cigarettes you smoke and how many years you’ve been smoking. Tobacco reduces blood flow to the gums, making it harder for your body to fight off bacterial infections and repair damaged tissue.
Diabetes creates another layer of risk. In one cross-sectional study of 427 people with type 2 diabetes, 95.1% had some degree of periodontal destruction. The relationship runs both directions: high blood sugar makes gum infections harder to control, and chronic gum inflammation can make blood sugar harder to manage. If you have diabetes, your gums deserve closer attention than average.
Prevalence also varies across racial and ethnic groups. In data from the Multi-Ethnic Study of Atherosclerosis, self-reported gum disease was highest among Chinese participants (39.8%), followed by Black participants (32.0%), white participants (26.0%), and Hispanic participants (17.4%). These differences likely reflect a combination of genetic susceptibility, access to dental care, and socioeconomic factors rather than any single cause.
Why So Many Cases Go Unnoticed
One reason gum disease is so widespread is that it typically causes no pain in its early and moderate stages. You can have significant tissue damage without realizing anything is wrong. The earliest form, gingivitis, shows up as red or swollen gums that bleed when you brush or floss. Many people dismiss this as normal or assume they’re brushing too hard. Without treatment, gingivitis can progress to periodontitis, where the infection moves below the gumline and starts breaking down bone.
By the time symptoms become obvious, things like persistent bad breath, receding gums, teeth that feel loose, or pain when chewing, the disease has often been progressing for years. This is a key reason dental professionals measure the depth of the pockets between your teeth and gums during routine visits. Those measurements catch damage you can’t feel yet.
What Gum Disease Actually Does
Gum disease starts with bacteria in dental plaque, the sticky film that forms on your teeth throughout the day. When plaque isn’t removed regularly, it hardens into tarite (calculus) that you can’t brush away. The bacteria trigger an immune response, and your body’s own inflammatory reaction does much of the tissue damage over time.
In mild periodontitis, pockets form between the teeth and gums, creating sheltered spaces where more bacteria accumulate. In moderate cases, these pockets deepen and bone loss begins. In severe periodontitis, enough bone has been destroyed that teeth loosen and may need to be removed. The progression is usually slow, playing out over years or decades, which is both good news (you have time to intervene) and bad news (it’s easy to ignore).
Lowering Your Risk
The basics matter more than anything else. Brushing twice a day with fluoride toothpaste and cleaning between your teeth daily with floss or interdental brushes removes the plaque that fuels gum disease. Regular dental cleanings remove hardened tartar that home care can’t reach. If you smoke, quitting reduces your gum disease risk over time, though the benefit isn’t immediate since years of smoking cause cumulative damage.
If you have diabetes, keeping your blood sugar well controlled directly protects your gums. And if you notice bleeding when you brush, don’t ignore it. Bleeding gums are inflamed gums, and inflammation is the first step in a process that, left alone, affects nearly half of all adults over 30.