Infected gums typically show a combination of redness, swelling, and bleeding, especially when you brush or floss. These signs can range from mild inflammation that’s easy to reverse to deep infection that threatens your teeth and jawbone. The key is knowing what to look for and understanding when the signs point to something that needs professional treatment.
What Healthy Gums Look Like
Before you can spot infection, it helps to know the baseline. Healthy gums are pink (though the exact shade varies with skin tone), feel firm when you press them gently with a clean finger, and sit snugly around each tooth without gaps or puffiness. They don’t bleed when you brush or floss, and your breath stays neutral throughout the day.
Any deviation from this picture is worth paying attention to, even if it doesn’t hurt. Gum infections are sneaky because the early stages are often painless, which means the problem can quietly progress for months before you notice.
Early Warning Signs of Gum Infection
The earliest stage of gum infection is gingivitis, and it generally doesn’t cause pain. That’s exactly why so many people miss it. Here’s what to watch for:
- Bleeding after brushing or flossing. This is often the very first sign. You might notice pink on your toothbrush bristles or blood when you spit. Sometimes gums bleed for no obvious reason at all.
- Red or darkened patches. Infected gums shift from their normal pink toward red, deep red, or purplish. Look for uneven color, particularly along the gumline.
- Swelling or puffiness. Inflamed gums look puffy and may appear shiny. They feel soft or squishy rather than firm when you press them.
- Persistent bad breath. Bacteria living beneath the gumline produce compounds that cause a lingering odor no amount of mouthwash fully eliminates.
- Tenderness. Your gums may feel sore or sensitive when you eat, brush, or touch them, though many people with early infection feel nothing at all.
You can check most of these yourself with a bathroom mirror. After brushing, look at the color and shape of your gums, check your toothbrush and floss for blood, and press gently along the gumline to feel for soft, swollen spots.
Signs the Infection Has Gone Deeper
When gingivitis goes untreated, it can progress to periodontitis. This is where the infection moves past the surface of the gum tissue and begins attacking the bone and ligaments that hold your teeth in place. The difference matters: gingivitis is fully reversible, but bone loss from periodontitis is not.
The hallmark of periodontitis is gum recession. Your gums pull away from the teeth, creating gaps called periodontal pockets. You might notice your teeth look longer than they used to, or you can see or feel a gap between the gum and the tooth that wasn’t there before. Food gets trapped more easily in these spaces, and the area may feel tender or produce an unpleasant taste. These pockets can grow several millimeters deep, and in severe cases more than a centimeter, giving bacteria a protected space to thrive far below the gumline.
Other signs of advanced infection include teeth that feel loose or shift position, pain when chewing, and changes in how your bite fits together. If the infection has been present long enough to affect the jawbone, you may notice a general instability in teeth that previously felt solid.
Gum Abscess: When Infection Becomes Acute
Sometimes a gum infection doesn’t just simmer. It forms an abscess, a localized pocket of pus that develops quickly and demands attention. There are two types, and they feel different.
A gingival abscess is relatively shallow, affecting only the soft gum tissue. It typically shows up as a sudden, painful, swollen lump on the gum near a tooth. It’s often triggered by something specific, like a trapped food particle or a minor injury to the gum. A periodontal abscess forms deeper, in the space between the tooth and bone. It produces a deep, throbbing pain that gets worse when you bite down, and it’s more commonly associated with chronic gum disease that has been present for a while.
Both types may produce visible pus, a thick yellowish fluid you might see oozing near the affected tooth or taste in your mouth. Swelling can extend beyond the gum into the cheek or jaw. If the infection spreads, you may develop a fever, fatigue, or body aches. Difficulty breathing or swallowing due to facial swelling is a medical emergency that requires immediate care.
What a Dentist Checks That You Can’t
Your at-home inspection can catch the visible signs, but a dentist measures what’s happening beneath the surface. The primary tool is a periodontal probe, a thin instrument inserted gently between the tooth and gum to measure pocket depth in millimeters. Healthy gums measure 1 to 3 millimeters. Anything above 3 millimeters raises concern, and deeper pockets indicate more advanced disease.
Your dentist also checks each tooth for bleeding on probing, loose teeth, tartar buildup below the gumline, and signs of recession. X-rays reveal whether the infection has started breaking down the jawbone, something you’d never detect on your own. This is why regular dental visits matter even when your gums look fine in the mirror. Periodontitis can be well underway before the visible signs become obvious.
What Causes Gum Infections
The root cause is bacterial plaque, the sticky film that constantly forms on your teeth. Bacteria in plaque are normal residents of a healthy mouth, but when plaque isn’t removed regularly, it triggers inflammation along the gumline. Left alone, plaque hardens into tartar (also called calculus), which can’t be removed by brushing. It requires professional cleaning. As tartar builds up, bacteria spread below the gumline, release toxins into the surrounding tissue, and the infection deepens.
Certain factors raise your risk significantly. Smoking is one of the strongest, and it also makes treatment less effective. Diabetes and gum disease have a two-way relationship: each condition worsens the other. Hormonal changes during pregnancy or menopause increase gum sensitivity to bacteria. Some medications cause dry mouth or gum overgrowth as side effects, both of which create conditions where infection thrives more easily. Stress, genetics, poor nutrition, obesity, crooked teeth, and teeth grinding all play a role as well.
Why Gum Infections Affect More Than Your Mouth
Chronic gum infection isn’t just a dental problem. The same bacteria and inflammatory signals that damage your gums can enter the bloodstream and affect other parts of the body. The links are well established for cardiovascular disease: the chronic inflammation and bacterial exposure from periodontitis contribute to damage in blood vessel walls and are associated with higher risk of heart attack, atherosclerosis, and high blood pressure.
The connections extend further. Periodontitis is linked to higher risk of respiratory infections like pneumonia and COPD, likely because oral bacteria can be inhaled into the lungs. Researchers have also found associations with rheumatoid arthritis, inflammatory bowel disease, and neurological conditions including Alzheimer’s disease. Bacteria from periodontal infections have been identified in brain tissue from Alzheimer’s patients. None of this means gum disease directly causes these conditions, but the chronic, low-grade inflammation it produces appears to contribute to or worsen them.
What Treatment Looks Like
For gingivitis, treatment is straightforward. Improved brushing and flossing habits, combined with a professional cleaning to remove tartar, can fully reverse the inflammation. Your gums may return to normal within a few weeks.
For periodontitis, the standard first step is scaling and root planing, often called a “deep cleaning.” This involves cleaning below the gumline to remove tartar and bacteria from the root surfaces of your teeth, allowing the gum tissue to reattach. It’s typically done under local anesthesia and may take two or more visits depending on severity. Success rates vary. A large retrospective study found that deep cleaning successfully reduced pocket depths to manageable levels in about 85% of front teeth and 78% of premolars, but only 47% of molars. Molars are harder to treat because their root structure is more complex, and when the infection has spread into the space where roots branch apart, treatment fails more than half the time.
Smoking dramatically reduces your chances of successful treatment. In the same study, treatment was unsuccessful in 71% of smokers compared to 57% of nonsmokers. Starting severity also matters: patients whose pockets measured 9 millimeters or deeper at the start were far less likely to respond to non-surgical treatment alone and often need surgical options.
The takeaway is that catching gum infection early makes a real difference. The further it progresses before treatment, the harder it becomes to manage and the more likely you are to face permanent bone loss or tooth loss.