Gum infections show up through a handful of reliable signs you can spot at home: red or swollen gums, bleeding when you brush or floss, persistent bad breath, and gums that feel tender or look puffy. These symptoms range from mild and reversible to serious enough to threaten your teeth, so knowing what to look for at each stage matters.
What Healthy Gums Actually Look Like
Before you can spot a problem, it helps to know what normal looks like. Healthy gum tissue is firm and slightly textured, almost like the surface of an orange peel. The color is a consistent pink, though natural variation exists depending on skin tone. Your gums should fit snugly against each tooth in a smooth, scalloped line, and they shouldn’t feel soft, loose, or sensitive when you brush.
If your gums look shiny, feel puffy, or have pulled away from any teeth, something has changed. That contrast between firm-and-stippled and swollen-and-shiny is one of the easiest things to check in a mirror.
Early Signs: Gingivitis
The earliest form of gum infection is gingivitis, and its hallmark symptom is bleeding. If your gums bleed when you brush or floss, even lightly, that’s not normal. Healthy gums don’t bleed from routine cleaning. Other early signs include gums that appear bright red or darker red than usual, puffiness along the gum line, tenderness when you press on the tissue, and bad breath that doesn’t go away after brushing.
Gingivitis happens when bacterial plaque, the sticky film that builds up on teeth throughout the day, isn’t removed thoroughly enough. The bacteria trigger your immune system, which responds with inflammation. That inflammation is what causes the redness, swelling, and bleeding. The good news is that gingivitis is fully reversible with better brushing and flossing habits and a professional cleaning.
Advanced Signs: Periodontitis
When gingivitis goes untreated, the infection can progress to periodontitis, a more serious condition that damages the bone and tissue supporting your teeth. At this stage, the signs become harder to ignore:
- Gum recession: your teeth look longer because the gum line has pulled back, exposing more of the tooth root
- Loose teeth: teeth that shift position or feel wobbly when you press on them
- Pain when chewing: especially when biting down on harder foods
- Pus along the gum line: a yellow or white discharge when you press on your gums
- Changes in your bite: your teeth no longer fit together the way they used to
- Persistent bad breath and an unpleasant taste in your mouth
The key difference between gingivitis and periodontitis is that periodontitis involves irreversible damage. The bacterial imbalance in plaque triggers a cycle of chronic inflammation that actually destroys gum tissue and bone. Once that bone is lost, it doesn’t grow back on its own. This is why catching a gum infection early matters so much.
Less Obvious Symptoms to Watch For
Not every gum infection announces itself with obvious bleeding or swelling. Some people notice a persistent metallic taste or chronic bad breath as their first clue. The bacteria responsible for gum disease are anaerobic, meaning they thrive in low-oxygen pockets beneath the gum line and produce foul-smelling compounds as a byproduct. If your breath consistently smells off despite good oral hygiene, that’s worth investigating.
Another subtle sign is sensitivity to temperature. As gums recede and expose tooth roots, you may notice sharp discomfort when drinking something cold or hot. Some people also feel a dull ache or pressure in the gums that’s hard to pinpoint to a specific tooth.
When a Gum Infection Becomes an Emergency
A gum infection can progress to an abscess, which is a pocket of pus that forms in the tissue. An abscess typically causes intense, throbbing pain that may radiate into your jaw, ear, or neck. You might notice a visible swelling on your gum that looks like a small bump or blister.
If you develop a fever along with facial swelling, that signals the infection may be spreading beyond your mouth. Difficulty breathing or swallowing with these symptoms means the infection could be reaching your jaw, throat, or neck, and that requires emergency care.
What Puts You at Higher Risk
Some people are more vulnerable to gum infections regardless of how well they brush. Smoking is one of the strongest risk factors. Smokers with diabetes who are 45 or older are 20 times more likely to develop severe gum disease than people without those risk factors.
Diabetes plays a particularly significant role. High blood sugar increases the sugar content in your saliva, which feeds the bacteria that cause gum disease. Diabetes also thickens blood, slowing the delivery of nutrients to gum tissue and making it harder for your body to fight infection. People with poorly controlled blood sugar develop gum disease more frequently, more severely, and lose more teeth than those who manage their levels well.
Dry mouth is another overlooked factor. Saliva helps wash away bacteria and neutralize acids in your mouth. More than 400 medications list dry mouth as a side effect, including many common antidepressants, blood pressure drugs, and antihistamines. If your mouth frequently feels dry, that reduced saliva flow gives bacteria an advantage.
How Dentists Confirm a Gum Infection
Your dentist uses a small measuring instrument to check the depth of the space between each tooth and the surrounding gum tissue. In a healthy mouth, these pockets measure 1 to 3 millimeters deep. Pockets deeper than 4 millimeters suggest periodontitis, and anything beyond 5 millimeters is difficult to clean effectively at home, meaning bacteria can accumulate unchecked no matter how diligent you are with brushing.
X-rays show whether bone loss has occurred beneath the gum line, which isn’t visible during a visual exam. Together, pocket depth measurements and imaging give a clear picture of how far an infection has progressed and what treatment is needed.
A Quick Self-Check You Can Do Now
Stand in front of a well-lit mirror and look at your gums. Check for color changes: healthy tissue is a consistent pink (adjusted for your natural skin tone), while infected gums tend toward bright red, dark red, or even purplish. Press gently along your gum line with a clean finger. Healthy gums feel firm and resilient. Infected gums feel soft, puffy, or tender.
Next, brush and floss normally. Watch for any pink on your toothbrush or blood when you spit. Note whether your gums feel sore afterward. Finally, run your tongue along the inside of your gum line and check whether any teeth feel like they’ve shifted or whether you can feel gaps forming between teeth and gums. Any combination of bleeding, color change, puffiness, recession, or persistent bad breath points toward a gum infection that warrants a dental visit.