It is easy to dismiss a dental problem as something that can wait.
That approach may help explain why an estimated one in three Americans—about 100 million people—do not receive routine dental checkups, according to Centers for Disease Control and Prevention (CDC) data. As a result, warning signs including tooth pain and swollen gums can go unnoticed or untreated.
Yet a growing body of research suggests the mouth can provide an early window into the body’s broader health. Oral changes may be among the first clues of serious, chronic conditions, including infections, diabetes, heart disease, liver disease and certain cancers.
“Contrary to many other parts of the body, the mouth is where a doctor can see bone, soft tissue, blood supply and bacteria all at once—without making an incision,” Dr. Yev Davydov, a general dentist and owner of Chroma Dental in New York City, told Our News Outlet.
“It is also the body’s entry point for everything you eat, drink and breathe. When something is happening elsewhere in the body, signs may appear in the mouth early.”
Billions of bacteria—some beneficial and others potentially harmful—live in the mouth. If the gums become inflamed or begin to bleed, bacteria can enter the bloodstream and potentially travel to vital organs, including the heart.
Persistent bad breath, meanwhile, should not always be attributed to garlic or other strong-smelling foods. In some cases, it can point to an infection or a health condition that is not under control.
Dentists told Our News Outlet which oral health problems deserve prompt attention—and should never simply be brushed aside.
Dental care is easy to neglect, but dentists say changes in the mouth can provide clues to several chronic diseases
Tooth pain
“Many people assume tooth pain is an early warning sign. In reality, it is often a late one,” Davydov said. “By the time a tooth starts hurting, the underlying problem may have been developing for months or even years.”
According to Davydov, bacteria in the mouth use sugar and starch as fuel, creating acid. Combined with the bacteria, that acid forms plaque—a sticky film that coats the teeth.
Without regular cleaning to remove it, plaque can harden into tartar. The buildup then attacks and weakens the enamel, eventually creating the small opening in a tooth known as a cavity.
Early cavities are painless and likely to go unnoticed unless a dentist spots them during a regular cleaning. As the decay worsens, sensitivity to cold and sweets may begin. Pain, however, typically starts once the decay reaches the nerve.
Dr Kami Hoss, orthodontist and founder and CEO of SuperMouth, cautions that once the affected nerve dies, pain may disappear, but that does not mean the threat is gone.
‘Left alone, that becomes an abscess, a pocket of infection in the jawbone with open access to the bloodstream,’ he told Our News Outlet.
‘That is no longer a dental problem. It is a chronic infection in the body.’
That infection can spread directly to the jawbone, surrounding teeth, sinuses and soft tissues in the face and neck.
Untreated dental infections have also been linked to a higher risk of diabetes, heart disease and dementia due to chronic inflammation and the bacteria hardening arteries, making cells resistant to insulin and triggering damage in the brain’s memory centers.
The CDC estimates about one in five adults ages 20 to 64 have at least one untreated cavity.
‘The practical point is simple. A cavity caught early is a small filling,’ Davydov said. ‘A cavity caught late is a root canal and a crown, or an extraction and an implant.
‘Pain is the body telling you that you have already skipped the cheap option and the dentist is now trying their best to perform damage control.’
Swollen or bleeding gums
Gum disease has been associated with heart disease, diabetes and blood cancers such as leukemia
‘If your hands bled every time you washed them, you would see a doctor that afternoon. Yet millions of people see pink in the sink every night and call it “sensitive gums,”‘ Hoss said.
‘Gums are not sensitive. They are inflamed, and inflamed gums mean the barrier between your mouth and your blood has already been breached.’
Puffy and bleeding gums are a sign of gum disease, or gingivitis. In the early stages, regular brushing and flossing can alleviate this, but if the issue persists for multiple weeks, it may be a sign of more advanced disease, known as periodontitis.
‘The bacteria move below the gumline, the body’s inflammatory response starts destroying the bone that holds the teeth in place, and that bone does not grow back,’ Davydov said.
‘This is the leading cause of tooth loss in adults, and it is almost entirely preventable if treated early.’
He also notes that the ‘systemic links are well documented.’ Periodontitis has long been associated with higher rates of heart disease, stroke and poorly controlled diabetes.
Severe gum disease triggers a constant immune response, raising inflammatory markers like C-reactive protein and cytokines, which over time damage blood vessels, raising blood pressure and potentially cutting off blood flow to the heart and brain.
Dr Kami Hoss, pictured above, told Our News Outlet that people with bleeding gums should use a toothbrush with soft bristles
Chronic inflammation from infected gums also makes the body less responsive to insulin, which may worsen diabetes.
‘Gums that swell, turn purple or bleed far more than the plaque would explain can also be the first visible sign of leukemia or a clotting disorder, and bleeding that comes with bruising, fatigue or fevers is a doctor visit, not just a dental one,’ Hoss said.
He suggests in addition to visiting a dentist, people with bleeding gums should use a toothbrush with soft bristles to reach the gumline and floss regularly.
Loose teeth
While losing your teeth is a rite of passage in childhood, in adulthood, ‘a loose tooth is always a problem,’ Davydov told Our News Outlet.
‘Teeth are anchored in bone by a ligament. If a tooth is loose, something has damaged the bone, the ligament or both,’ he added.
Tooth loss is normally caused by advanced gum disease, in which chronic infection over several years has eaten away at the bone, leaving it unstable.
Davydov notes it may also be due to teeth grinding at night, which puts excess force on teeth that supporting bones are not equipped to handle, leading to teeth loosening over time.
‘Once a tooth is loose from bone loss, it is on a path to being lost, and the bone around it keeps shrinking after the tooth is gone,’ he said.
‘That is why people who lose teeth to gum disease also lose the option of easy implants later. There is not enough bone left to put them in.’
In rare cases, a loose tooth that has no obvious dental cause such as grinding or gum disease may be a sign of a tumor or cyst in the jaw.
‘Tumors and cysts in the jaw, both benign and malignant, can destroy bone and loosen teeth from the inside,’ Davydov said. ‘Certain cancers that spread to the jaw present the same way.
‘A single loose tooth in an otherwise healthy mouth, with no gum disease and no history of trauma, needs imaging and a proper diagnosis. It should never be dismissed.’
Lingering bad breath or taste
Bad breath is normal from time to time, but a persistent foul smell may be linked to autoimmune disorders or kidney disease (stock image)
It’s common for strong foods like garlic and fish to cause smelly breath for a few hours.
But if foul breath doesn’t go away after brushing, it’s ‘a diagnosis waiting to be made, not a hygiene failure,’ Hoss told Our News Outlet.
Bacteria that gets trapped under the gums, within deep cavities in the crevices of the tongue or around a crown or filling produce sulfur compounds, creating a foul smell.
Hoss also notes a common cause is the tongue, which many people neglect to clean with a dedicated tongue cleaner.
‘Dry mouth is the most underestimated cause of all,’ he said. ‘Saliva is the mouth’s immune system: it buffers acid, rebuilds enamel and washes bacteria away, and hundreds of common medications, mouth breathing and alcohol-based mouthwash all reduce it.’
Additionally, a persistent bad taste ‘can also point beyond the mouth,’ Hoss notes.
Sjögren’s disease, an autoimmune condition that damages moisture-producing glands, has been shown to cause dryness in the mouth, causing microbes to multiply and result in bad odors.
Kidney disease also results in a failure to filter waste products from the blood, leading to a buildup of toxins called urea. When urea enters the saliva, it breaks down into ammonia, which causes a sharp odor.
Persistent mouth sores
Most sores in the mouth are canker sores, painful ulcers that usually come from biting the cheek, but in some cases, they could signal something serious.
‘The rule I give patients is simple. Any sore, lump, white patch, red patch or rough area in the mouth that has not healed in two weeks needs to be looked at,’ Davydov said.
‘Not watched. Looked at.’
Davydov warns sores that do not heal may be a sign of oral cancer, especially on the side of the tongue.
Striking about 60,000 Americans every year and killing 13,000, oral cancer is often caused by tobacco smoking, heavy alcohol use and the sexually transmitted infection human papillomavirus (HPV).
‘Caught early, survival is excellent. Caught late, it is one of the more disfiguring and deadly cancers there is,’ Davydov said.
‘The difference is often whether somebody looked in the mouth in time.’
Hoss also notes recurring sores canker sores have been linked to deficiencies in vitamins such as folate, iron and B12, as well as autoimmune conditions such as lupus due to inflamed mucous membranes in the mouth.
What you can do
People with a history of gum disease may require more frequent cleanings, such as every three months
Davydov stresses that preventing serious diseases in the mouth ‘is not complicated.’
He suggests brushing twice per day with a toothpaste containing fluoride, which has been shown to strengthen enamel and prevent tooth decay. Flossing is also key for preventing gum disease.
‘Do not smoke. Drink water,’ he told Our News Outlet.
‘Get a professional cleaning and examination at least twice a year because plaque hardens into tartar within days, and no amount of home care removes tartar once it forms.’
Patients with a history of gum disease may need to be seen every three to four months to keep bacteria from repopulating below the gumline, and those with conditions linked to mouth issues, such as heart disease and diabetes, may require more frequent monitoring.
‘Oral care is medical care,’ Hoss told Our News Outlet. ‘Your mouth has been trying to tell you about the rest of your body your entire life. It is worth learning to listen.’
