Short answer
- The five signs most often linked with gum disease are bleeding gums, red, swollen, or tender gums, gums that have moved away or downward from the teeth, persistent bad breath or a bad taste that does not clear with cleaning, and loose, shifting, or sensitive teeth or painful chewing. The CDC lists red, swollen, or tender gums, bleeding gums, gums that have moved away from teeth, loose or sensitive teeth, painful chewing, and any change in how teeth fit together when biting or in how a partial denture fits among the signs and symptoms of gum disease. Early disease, called gingivitis, involves inflamed gums that are red, swollen, and may bleed easily, and it is reversible. If it is not treated, it can progress to periodontitis, a chronic condition involving destruction of the supporting tissues and bone loss around teeth. Periodontitis cannot be reversed, but it can be slowed and managed with professional treatment, as the CDC and the National Institute of Dental and Craniofacial Research (NIDCR) explain. You do not need all five signs to justify a visit. Any one persistent sign is a reason to book a dental check, and signs such as marked swelling, pus, a newly loose tooth, or difficulty opening the mouth or swallowing need prompt or urgent assessment.
By Emma Hudson
Gum disease often starts quietly. A little blood in the sink when you brush, gums that look redder or puffier than usual, or breath that stays unpleasant even after cleaning can all be early warnings, and they are easy to explain away. That is part of the problem. The Centers for Disease Control and Prevention (CDC) notes that gum disease can often become serious before a person notices symptoms, and the American Dental Association (ADA) patient resource MouthHealthy notes that gum disease is usually painless. A mouth that feels comfortable can still need attention, and a sign that seems minor can be the earliest stage of a condition that is much simpler to deal with when it is caught early.
This article explains the five signs most often linked with gum disease, what each sign can and cannot tell you, how the early stage called gingivitis differs from the more serious stage called periodontitis, who faces a higher risk, what a dentist actually checks, and which symptoms need prompt or urgent care. It is general information only. It is not a diagnosis, and it does not replace advice from your own dentist. Only a dental examination can diagnose gum disease, so treat every sign below as a reason to discuss your gums with a dentist, never as a self-diagnosis.
What gum disease is
Gum disease, also called periodontal disease, is a broad term for conditions involving inflammation and infection of the tissues that surround and support the teeth, including the gums and the bone that holds teeth in place. The CDC uses that definition, and NIDCR describes it in similar terms, as an infection that causes inflammation of the tissues that hold your teeth in place.
The process usually starts with plaque. Bacteria that normally live in the mouth constantly form a sticky film on tooth surfaces called plaque, as the CDC explains. Brushing and cleaning between the teeth remove it each day. If plaque builds up along the gumline, it irritates the gums. If it is not removed, it hardens into tartar, also called calculus. Tartar cannot be removed by toothbrushing. Only a professional cleaning by a dentist or dental hygienist can remove it, a point both the CDC and NIDCR make clearly. Daily cleaning therefore controls soft plaque, but it does not remove hardened tartar and does not replace an examination. Bacteria in buildup can also spread below the gumline and contribute to a periodontal pocket, an abnormal deepening of the space between tooth and gum. The CDC explains that bacteria in a pocket can release toxins that worsen inflammation and contribute to destruction of gum tissue and bone. Pockets collect more plaque where a toothbrush cannot reach well, which is why later disease needs professional treatment rather than harder brushing.
Gingivitis and periodontitis are not the same stage
Gingivitis is the mildest and earliest form. The CDC describes it as an inflammatory condition where the gums become red, swollen, and may easily bleed. MouthHealthy lists the same early picture: gums that bleed easily, red, swollen, tender gums, and bad breath. Gingivitis is reversible. The CDC states that it can be largely prevented and treated with a combination of routine oral hygiene and professional cleanings, and NIDCR states that early gum disease caused by plaque buildup can often be reversed by daily brushing and flossing, alongside professional care where it is needed.
Periodontitis is the later, more serious stage. The CDC describes it as a chronic inflammatory condition that leads to mild, moderate, or severe destruction of the supporting tissues, with bone loss as a main feature. NIDCR explains that untreated disease can spread to the bones supporting the teeth, making it painful to chew, and that in the worst cases teeth may become loose or need to be removed. Periodontitis cannot be reversed, because lost bone and attachment do not simply grow back. It can be slowed and managed with professional treatment. The CDC also notes that periodontitis and cavities are the two leading causes of tooth loss. Acting at the gingivitis stage gives the best chance of a simple outcome. The CDC reports that about 4 in 10 US adults age 30 or older had periodontitis in 2009 to 2014, and about 60 percent of adults age 65 or older had it in the same period. Common does not mean safe to ignore. It means dentists see this every day, and asking for a check is routine care.
Sign 1: Bleeding gums
Bleeding when you brush or clean between your teeth is often the first sign people notice, and it appears on every primary source list for this article. The CDC lists bleeding gums as a sign of gum disease. NIDCR lists gums that bleed easily among its gum symptoms. The NHS lists gums bleeding when you brush your teeth, floss, or eat hard foods such as apples as a symptom, and advises seeing a dentist if your gums bleed when you brush or eat hard foods.
Healthy gums should not bleed routinely. MouthHealthy explains that in some cases bleeding gums can be a sign of gingivitis, the early stage of periodontal disease, and advises that if your gums bleed easily or bleed when you brush, you should talk to your dentist about your oral health. Bleeding does not automatically mean advanced disease. It does usually mean inflammation is present, most often because plaque has built up along the gumline and irritated the tissue.
Other contributors are possible. MouthHealthy notes that gums may bleed at first when you start a new routine of cleaning between the teeth, usually settling in about a week, that some pregnant women develop pregnancy gingivitis with swelling, tenderness, and a little bleeding, that blood thinners can make gums bleed, and that brushing too hard can cause bleeding. It advises a soft bristled toothbrush, contacting a physician if bleeding does not stop quickly when blood thinners are involved, and an appointment if gums bleed regularly or enough to worry you. Do not stop cleaning because your gums bleed. Stopping allows more plaque to build up and worsens inflammation. Keep up gentle daily cleaning, and if bleeding continues after a week or two of careful cleaning, or keeps returning, book a dental appointment. A dentist can interpret persistent bleeding by examining the gums, measuring pockets, and checking for tartar in a way a mirror check cannot.
Sign 2: Red, swollen, or tender gums
Healthy gums are usually firm and pale pink, although natural color varies from person to person, and they fit snugly around the teeth. Gums affected by early disease often look redder or darker than usual, look puffy or swollen, and may feel tender or sore. The CDC lists red, swollen, or tender gums first among its signs and symptoms. NIDCR describes gum disease as starting with swollen, red, and bleeding gums, and lists gums that may be red, swollen, or tender in its symptoms table. The NHS describes gum disease as gums becoming red, swollen, and sore, and advises seeing a dentist if your gums are painful and swollen.
Swelling also changes the shape of the gum edge. Inflamed gums can look rounded and appear to cover a little more of the tooth than usual. Redness and swelling together with bleeding form a strong early warning pattern, even without pain. Because early gum disease is usually painless, absence of pain is not evidence that gums are healthy. Tenderness, soreness after brushing, or gums that look different from your usual are enough to raise at a dental visit. You do not need to decide whether the change counts as disease. That judgment belongs to the examination.
Sign 3: Gums pulling away from teeth
Gums that have moved away or downward from the teeth, exposing more of the tooth or its root, are a sign that the supporting tissues have been affected. The CDC lists gums that have moved away or downward from your teeth as a sign, and NIDCR lists gums pulling away from the teeth, making the teeth appear longer, in its gum symptoms. The NHS describes the same change as gums shrinking, and lists it among the things gum disease can lead to.
This change is often called recession. It can make teeth look longer and more sensitive, because root surfaces are not covered by enamel. Our article on sensitive teeth and cold food explains why cold food and drink can hurt and which sensitivity symptoms need a prompt appointment. As gum tissue pulls away, spaces can deepen where plaque collects below the gumline, in places home cleaning controls poorly. Mention a visible change at your next visit, and sooner if it is changing quickly, affects one tooth more than its neighbors, or arrives with pain, swelling, or a bad taste. A dentist can measure pockets and check for bone loss. Not every case of recession is caused by gum disease alone. Brushing technique and tooth position can also be involved, which is why the finding needs an examination rather than a label applied at home.
Sign 4: Persistent bad breath or a bad taste
Persistent bad breath, and a persistent bad taste, are listed as gum disease signs by all of the primary sources used here. MouthHealthy lists bad breath among the early symptoms of gingivitis, and notes in its gum disease myths guidance that persistent bad breath or a bad taste in your mouth can be an indicator of gum disease and other oral diseases, so it is important to uncover what is causing the problem. NIDCR lists persistent bad breath under its other symptoms of gum disease. The NHS states that gum disease can lead to bad breath and a bad taste in your mouth, and lists having bad breath among its reasons to see a dentist.
Occasional bad breath after strong foods, first thing in the morning, or with a dry mouth is ordinary. The pattern that matters is breath that stays unpleasant despite brushing and cleaning between the teeth, a bad taste that keeps returning, or breath changes alongside bleeding, swelling, or recession. Bacteria in plaque and in pockets produce unpleasant smelling substances, and debris trapped in pockets adds to the problem, so breath that does not respond to cleaning may point to a place home cleaning cannot reach. Bad breath also has other possible causes, including decay and dry mouth, so persistent bad breath deserves a dental check to find the cause rather than mouthwash used to mask it.
Sign 5: Loose, shifting, or painful teeth
Teeth that feel loose, that have shifted position, or that hurt when chewing are later signs, and they suggest that the tissues and bone supporting the teeth have been damaged. The CDC lists loose or sensitive teeth, painful chewing, any change in the way your teeth fit together when biting, and any change in how well a partial denture fits. NIDCR lists loose or sensitive teeth and pain while chewing, and explains that in advanced gum disease the bone supporting the teeth is destroyed, which may cause looseness and shifting of teeth in the mouth. The NHS states that gum disease can lead to teeth becoming loose or falling out, and asks patients to seek an urgent dentist appointment if, alongside gum disease, teeth are becoming loose or falling out.
These signs do not mean a tooth will certainly be lost. They do mean prompt professional assessment is needed, because treatment at this stage focuses on controlling infection and preserving support. Do not test a loose tooth by wiggling it, and do not wait to see whether a changed bite settles. New spaces, a drifted tooth, or a denture that suddenly fits differently can reflect changes in support that only an examination and, where needed, X-rays can assess. Pain when chewing can also come from decay, a cracked tooth, or an abscess, which is a further reason to have it examined promptly.
Early signs compared with later signs
Early signs are usually bleeding, redness, swelling, and tenderness. They may come and go and cause little or no pain. Later signs include gums pulling away, persistent bad breath or a bad taste, gum abscesses, which the NHS describes as collections of pus under the gums or teeth, loose or shifting teeth, painful chewing, and changes in bite or denture fit. Early gingivitis is often reversible with improved hygiene and professional cleaning. Periodontitis requires professional treatment, may require deep cleaning or surgery in advanced cases, and involves support already lost. The earlier a sign is acted on, the simpler treatment is likely to be.
In the mirror, early disease may look undramatic: gums redder than usual, slightly swollen along the edge, and prone to bleeding when brushed. A visual check alone is not enough. A dentist also checks for bleeding on probing and measures pocket depths, which can reveal inflammation not obvious at home. Use what you can see as a prompt to seek care, not as a complete assessment.
Who faces a higher risk
Anyone with plaque buildup can develop gingivitis, but the primary sources agree on factors that raise the risk or make disease more severe. The CDC lists smoking, diabetes, poor oral hygiene, medication with oral side effects, stress, genetics, crooked teeth or teeth grinding and clenching, underlying systemic conditions, hormonal changes such as with pregnancy or menopause, and poor nutrition or obesity among the factors studies have associated with gum disease. NIDCR states that smoking or using tobacco products is the most significant risk factor, that tobacco use can also delay healing and make treatment less successful, and that other risk factors include older age, diabetes, and genetics, with stress, certain illnesses, and hormonal changes in girls and women also associated. MouthHealthy gives a closely matching list for gingivitis, including poor dental care, smoking or chewing tobacco, genetics, crooked teeth that are hard to keep clean, pregnancy, diabetes, and certain medications, including steroids, certain anti-epilepsy drugs, cancer therapy drugs, some calcium channel blockers, and oral contraceptives.
If one or more of these factors applies to you, regular checks matter even more, and your dentist needs to know your medical history, medications, and tobacco use. NIDCR notes that dentists ask about medical history because factors such as tobacco use and diabetes can contribute. The CDC notes that untreated periodontitis can make conditions such as diabetes worse, and the NHS advises regular checkups especially in pregnancy or type 2 diabetes. Diet belongs here only in general terms. Poor nutrition is listed by the CDC as an associated factor, and readers who want background can see our article on foods that reduce inflammation, but no food treats gum disease and diet does not replace plaque removal or dental treatment.
What a dentist checks
NIDCR sets out the main elements of a gum examination. The dentist examines your gums for inflammation, bleeding, and recession, and uses a tiny ruler called a probe to measure the spaces around the teeth, the pockets. In a healthy mouth, pockets are usually between 1 and 3 millimeters. Deeper pockets can be a sign of periodontal disease. The dentist also checks the teeth for looseness or shifting, asks about medical history and risk factors such as tobacco use and diabetes, and may take X-rays, which can show bone loss. The NHS adds that your dentist may refer you to a specialist, with treatment depending on severity. NIDCR notes that referral may be to a periodontist, a specialist in gum disease. How often checks should happen is individual. Our guide to how often you should go to the dentist explains how intervals are set and why a yearly check can detect disease before symptoms appear, a point the CDC also makes.
What you can do at home, and where home care stops
Home care is powerful against early disease, and its limits matter too. NIDCR advises brushing twice a day with fluoride toothpaste, flossing regularly, visiting the dentist routinely for a checkup and professional cleaning, and quitting all forms of tobacco. Instead of floss, an interdental brush, a pick, or a water flosser recommended by a dental professional can clean between teeth. The NHS gives the same core routine, adding: spit after brushing and do not rinse, clean between teeth every day, and do not smoke. MouthHealthy adds a soft bristled brush, which also matters if hard brushing has caused bleeding. Plaque control is also helped by how often sugary food and drink reach your teeth. Our guide to healthy Halloween snacks and treats for kids covers that frequency principle for families, and it applies year round: repeated snacking, not only total amount, makes plaque control harder.
Treatment itself is professional care, described here only in general terms, not as a recommendation for any individual. NIDCR states that the main goal is to control the infection, that treatment varies with the extent of disease, and that people with periodontal disease need treatment from a dentist or dental hygienist. That may include scaling and root planing, a deep cleaning of tooth and root surfaces, cleaning advice, prescribed medication such as an oral rinse in some cases, and surgery in advanced cases. The CDC lists the same broad categories. Any treatment requires good daily care at home to support it, and a dentist may suggest quitting tobacco to improve results. What you need can only be decided after your own examination.
Signs that gum health is improving
As early gum disease improves with consistent home care and professional cleaning, the changes are usually gradual and mirror the warning signs in reverse. Bleeding usually reduces and then stops being routine, redness fades toward your normal gum color, swelling settles so the gum edge looks firm again, and breath may improve as plaque and pocket debris are controlled. NIDCR states that early gum disease can often be reversed by daily brushing and flossing, so improvement at the gingivitis stage is a realistic expectation when cleaning becomes consistent and tartar has been professionally removed.
If bleeding returns after improving, it may mean plaque has built up again or that a pocket needs further attention. Mention it at your next visit, or book sooner if it persists. For periodontitis, a good outcome is disease that is controlled and stable, with inflammation reduced and no further loss of support, even though support already lost has not grown back. Your dentist can judge this from repeat pocket measurements, not appearance alone.
Gum disease is not tooth decay
Tooth decay, also called cavities, affects the tooth structure itself. Gum disease affects the gums and supporting tissues and bone. The CDC treats them as distinct, noting that periodontitis and cavities are the two leading causes of tooth loss. Both are linked to plaque and can occur together, but they need different treatments. A dental examination is how uncertainty about a symptom is resolved.
When to see a dentist
Book a dental check promptly if any of the five signs persists. The NHS advises seeing a dentist if your gums bleed when you brush or eat hard foods, if your gums are painful and swollen, if you have bad breath, or if your child has sore, bleeding gums. The CDC advises a dental checkup at least once a year, or more often if recommended, alongside twice daily brushing, daily flossing, and regular professional cleanings. Do not wait for all five signs, and do not wait for pain. One persistent sign is enough.
Ask for an urgent dentist appointment if you have gum disease with very sore and swollen gums, teeth becoming loose or falling out, ulcers or red patches in your mouth, or a lump in your mouth or on your lip, which is the urgent list the NHS gives for gum disease. Pus around the teeth or gums, a gum abscess, or swelling that is spreading also need urgent assessment. Seek emergency care without delay if a dental problem comes with difficulty breathing, speaking, or swallowing, a lot of swelling in the mouth, difficulty opening the mouth, or swelling affecting the eye or vision, because the NHS dental abscess guidance treats those as immediate action signs of a spreading infection. Fever alongside facial or gum swelling likewise needs same day urgent advice. If you do not have a regular dentist, contact a local dental practice for an urgent appointment or use local urgent care routes rather than waiting for a routine opening. While you wait for any of these appointments, keep up gentle brushing and cleaning between the teeth unless a dentist advises otherwise. Do not stop brushing because your gums bleed.
Frequently asked questions
What are the early signs of gum disease?
Bleeding when brushing or cleaning between the teeth, red or swollen gums, and tenderness are the common early signs listed by the CDC, NIDCR, the ADA, and the NHS. Bad breath can also appear early. Early signs may cause little or no pain, which is why they are easy to miss and why regular checkups matter.
How do I know if I have gum disease?
Signs at home can prompt a visit, but they cannot confirm the condition. Only a dental examination can diagnose gum disease. NIDCR describes that examination as including a gum check for inflammation, bleeding, and recession, pocket measurements with a probe, where 1 to 3 millimeters is the usual healthy range, a teeth check, a medical history review, and X-rays where bone loss needs to be assessed.
Is gum disease reversible?
Gingivitis usually is. The CDC calls gingivitis a reversible condition that can be largely prevented and treated with routine oral hygiene and professional cleanings, and NIDCR states that early gum disease can often be reversed by daily brushing and flossing. Periodontitis is not reversible. The CDC states plainly that periodontitis cannot be reversed, but it can be slowed down and managed with professional treatment.
Should I stop flossing if my gums bleed?
No. MouthHealthy notes that gums may bleed at first when a new routine of cleaning between the teeth begins, and that this usually goes away on its own in about a week. Stopping cleaning allows plaque to build up and makes inflammation worse. Keep cleaning gently and daily, and if bleeding is regular, persists beyond a week or two of careful cleaning, or worries you, make an appointment with your dentist or physician, as MouthHealthy advises.
What does a dentist do for gum disease?
It depends on severity. The NHS explains that early treatment is cleaning advice, stopping smoking where relevant, and cleaning by a hygienist, while serious disease may need deep cleaning under the gums, medication, gum surgery, or removal of teeth that cannot be saved. NIDCR and the CDC describe deep cleaning as scaling and root planing. Your dentist will explain what applies in your case and may refer you to a periodontist.
Can gum disease go away on its own without treatment?
Early inflammation can settle when plaque removal becomes thorough and consistent, but tartar cannot be removed at home, pockets cannot be measured at home, and periodontitis needs professional treatment, as NIDCR and the CDC describe. Relying on symptoms disappearing is risky because gum disease is usually painless and can become serious before symptoms appear.
When does a gum problem become urgent?
Ask for an urgent dentist appointment for very sore and swollen gums, teeth becoming loose or falling out, ulcers or red patches, or a lump in the mouth or on the lip, following NHS guidance. Get emergency care immediately for difficulty breathing, speaking, or swallowing, a lot of swelling in the mouth, difficulty opening the mouth, or swelling affecting the eye or vision. Those are signs a dental infection may be spreading and must not wait for a routine appointment.
Sources & references
- Centers for Disease Control and Prevention (CDC), About Periodontal (Gum) Disease, cdc.gov, page dated 15 May 2024, opened in full during adaptation. Definition of periodontal disease, gingivitis as reversible and periodontitis as irreversible but manageable, signs and symptoms list, risk factors, plaque and tartar and pocket formation, prevalence figures, prevention routine, and treatment categories.
- National Institute of Dental and Craniofacial Research (NIDCR), Periodontal (Gum) Disease, nidcr.nih.gov, opened in full during adaptation. Plaque hardening into tartar and professional removal only, symptoms by area, smoking as the most significant risk factor, diagnosis including probe measurements of 1 to 3 millimeters in a healthy mouth and X-rays for bone loss, treatment goal of controlling infection including scaling and root planing, and home care tips.
- American Dental Association (ADA), MouthHealthy, Gingivitis and Bleeding Gums, mouthhealthy.org, both pages opened in full during adaptation. Early symptoms, risk factor list, reversibility of gingivitis, usually painless nature of gum disease, bleeding in a new cleaning routine settling in about a week, pregnancy gingivitis, blood thinners and hard brushing as other causes of bleeding, soft bristled brush advice, and brush twice a day and floss once a day routine.
- NHS, Gum Disease, nhs.uk, page last reviewed 20 April 2026, opened in full during adaptation. Symptoms including bleeding on brushing, flossing, or eating hard foods, non urgent and urgent advice lists, dentist examination and referral, early and serious treatment descriptions, and prevention routine including fluoride toothpaste twice a day, daily cleaning between teeth, and not smoking. NHS dental abscess guidance, via the NHS health content widget, was also read for the emergency signs of difficulty breathing, speaking, or swallowing, extensive mouth swelling, and difficulty opening the mouth.
