Gum Disease: Why Bleeding Gums Are Not Normal
“My gums bleed a bit when I brush” is said as casually as “my hands get cold”. Healthy gums do not bleed when brushed. Bleeding is inflammation, and inflammation is the first stage of a process that eventually loosens teeth.
Two stages, one reversible
Gingivitis. Inflammation of the gum tissue, caused by plaque bacteria at the gum line. Gums are red, swollen, tender and bleed when brushed or flossed. Bad breath is common.
This stage is entirely reversible with proper cleaning and a professional scale. No permanent damage has occurred.
Periodontitis. If gingivitis persists, inflammation extends deeper and begins destroying the ligament and bone that hold the tooth in place. Pockets form between gum and tooth, filling with bacteria. Gums recede, teeth appear longer, gaps open between them, teeth loosen and eventually can be lost.
This stage is not reversible. Treatment halts progression and can achieve substantial improvement, but lost bone does not regrow in most cases.
That is the entire argument for acting on bleeding gums.
Warning signs
- Gums that bleed when brushing or flossing
- Red, swollen or tender gums
- Persistent bad breath or a bad taste
- Gums pulling away from teeth
- Teeth appearing longer
- New gaps appearing between teeth
- Loose teeth, or a change in how teeth fit together when biting
- Pus at the gum line
- Pain when chewing
Periodontitis is frequently painless until advanced, which is why it is so often found late.
Risk factors
- Smoking, the single largest modifiable risk factor. It also masks the disease by reducing bleeding, so smokers often appear healthier than they are while progressing faster
- Diabetes, particularly poorly controlled
- Genetics
- Hormonal changes in pregnancy and menopause
- Certain medicines causing gum overgrowth or dry mouth, including some anti-epileptics, calcium channel blockers and immunosuppressants
- Dry mouth from any cause, since saliva is protective
- Poor nutrition, especially vitamin C deficiency
- Stress
- Grinding teeth, which adds mechanical load
- Immunosuppression
The diabetes connection runs both ways
This is well established and still under-appreciated.
Poorly controlled diabetes raises the risk and severity of gum disease, through impaired immune response and reduced healing.
And periodontitis makes blood glucose harder to control, because chronic inflammation increases insulin resistance. Studies have shown that treating periodontal disease produces a measurable improvement in HbA1c, comparable in size to adding a medicine.
So anyone with diabetes should be having regular periodontal assessment, and anyone with persistent gum disease should have their glucose checked.
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Other systemic associations
Periodontitis is associated with cardiovascular disease, adverse pregnancy outcomes including preterm birth and low birth weight, respiratory infections particularly aspiration pneumonia in older adults, rheumatoid arthritis, and increasingly studied links with cognitive decline.
An honest note on causation: association is clearly established, but proving that treating gum disease prevents heart attacks has been harder. The mechanism, chronic systemic inflammation and bacteraemia, is plausible. Either way, the dental reason alone is sufficient.
Brushing, which most people do incorrectly
- Twice daily, two minutes. Most people brush for under a minute and overestimate
- Angle the brush at 45 degrees to the gum line, not flat against the tooth. Plaque at the gum margin is what causes gum disease, and brushing only the flat tooth surface misses it
- Short, gentle strokes or small circles. Hard scrubbing causes gum recession and wears enamel at the neck of the tooth
- Soft bristles. Medium and hard brushes do more harm than good
- Electric brushes, particularly oscillating-rotating types, remove more plaque than manual brushing in trials
- Spit, do not rinse, after brushing. Rinsing washes away the concentrated fluoride that would otherwise keep working
- Replace the brush every three months, or sooner when bristles splay
- Brush before breakfast or wait 30 minutes after, because acidic food softens enamel temporarily
Cleaning between teeth
A toothbrush cleans roughly three of the five surfaces of a tooth. The two surfaces between teeth are where gum disease and decay most often begin.
Interdental brushes are more effective than floss where the gaps allow them, which is most adults with any degree of gum recession. Get the right size, or a few sizes; too small does nothing and too large damages tissue.
Floss is appropriate where gaps are too tight for a brush. Curve it into a C shape around each tooth and move it under the gum line, rather than snapping it straight down.
Water flossers help people with braces, bridges and implants, and those who cannot manage other methods.
Whichever you use, doing it once daily matters far more than which one you choose.
Treatment
Gingivitis: professional scaling plus corrected home technique. Bleeding typically settles within one to two weeks.
Periodontitis: scaling and root planing, a deeper cleaning below the gum line, sometimes under local anaesthetic and usually over several visits. Then regular maintenance appointments, often three-monthly rather than six, because recolonisation is rapid.
More advanced cases may need surgical access, regenerative procedures, or extraction of hopeless teeth.
Antibiotics are an adjunct in specific situations, not a substitute for mechanical cleaning. The biofilm has to be physically disrupted.
Antiseptic mouthwash such as chlorhexidine is useful short term, with staining and taste disturbance limiting longer use. Mouthwash never replaces brushing.
When to see a dentist promptly
- Gums bleeding for more than a week or two despite good cleaning
- Any loose tooth in an adult
- Pus, or a swelling on the gum
- Facial swelling with dental pain, which can spread and become serious
- Persistent bad breath despite good hygiene
- A mouth ulcer that has not healed in three weeks, which needs assessment to exclude oral cancer
The short version
Gums that bleed are inflamed, not normal. Caught at the gingivitis stage it reverses completely; left alone it becomes bone loss that does not come back. Angle the brush at the gum line, clean between the teeth daily, spit instead of rinsing, and if you have diabetes treat your gums as part of your diabetes care rather than a separate matter.