Dental issues can feel easy to shrug off.

In fact, Centers for Disease Control and Prevention (CDC) figures estimate as many as one in three Americans – or 100 million – don’t get regular dental checkups, leaving issues such as tooth pain and puffy gums to linger undetected.

But an increasing body of research shows the mouth is a crucial indicator of overall health – often showing the first signs of chronic and debilitating conditions such as infections, diabetes, heart disease, liver disease and even some forms of cancer.

‘The mouth is the one part of the body where a doctor can see bone, soft tissue, blood supply, and bacteria at the same time without cutting anything open,’ Dr Yev Davydov, general dentist and owner of Chroma Dental in New York City, told the Daily Mail.

‘It is also the entry point for everything you eat, drink and breathe. Whatever is happening in the rest of the body tends to show up there early.’

The mouth is home to billions of healthy and harmful bacteria. When gums become inflamed or bleed, bacteria seep into the blood vessels and carry germs to major organs such as the heart.

And while bad breath may be easy to blame on eating too much garlic or smelly fish, it may be a sign of harmful infections and uncontrolled health conditions.

Below, dentists have revealed to the Daily Mail the dental woes that should never be ignored.

While it’s easy to overlook dental care, the mouth can signal multiple chronic diseases, dentists warn

Tooth pain

‘Contrary to many people’s beliefs, tooth pain is a late signal, not an early one,’ Davydov said. ‘By the time a tooth hurts, the problem has usually been building for months or years.’

Davydov explains that bacteria in the mouth feed on sugar and starch, producing acid that, along with the bacteria, forms a sticky film on the teeth called plaque.

If that plaque is not removed through cleaning, it hardens into tartar that dissolves enamel and forms a tiny hole in the tooth, otherwise 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 the Daily Mail.

‘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

‘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.

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 the Daily Mail.

‘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

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 the Daily Mail.

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 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 the Daily Mail.

‘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 the Daily Mail. ‘Your mouth has been trying to tell you about the rest of your body your entire life. It is worth learning to listen.’