A tooth that appears to be bleeding is almost always bleeding from the gum tissue surrounding it, not from the tooth itself. The most common reason is gum inflammation caused by bacterial buildup along the gumline, a condition called gingivitis that affects a surprisingly large portion of adults. Over 42% of Americans aged 30 and older have some form of gum disease. The good news: in most cases, bleeding gums are reversible with consistent care at home.
Plaque Buildup Is the Most Common Cause
A sticky film of bacteria called plaque constantly forms on your teeth. When it isn’t removed through brushing and flossing, it accumulates along and under the gumline. As this bacterial layer matures, it releases compounds that penetrate the delicate tissue lining the space between your gum and tooth. Your immune system responds by flooding the area with inflammatory signals, which cause the tiny blood vessels in your gums to widen and become more permeable. That’s why the tissue looks red, feels puffy, and bleeds easily when touched by a toothbrush or floss.
If you’ve recently started flossing again after a break, some bleeding is normal and typically clears up within about a week of consistent daily flossing. This is your gums adjusting, not a sign you’re doing damage. Stopping because of the bleeding actually allows the problem to get worse.
Gingivitis vs. Periodontitis
Gingivitis is the earliest stage of gum disease. It causes mild redness, slight swelling, and bleeding during brushing or flossing. At this stage, the damage is limited to the soft tissue and is fully reversible with better oral hygiene.
When gingivitis goes untreated, it can progress to periodontitis, a more serious condition. The differences are noticeable:
- More severe bleeding: Gums bleed even during gentle brushing or with very little pressure.
- Gum recession: The gums pull away from the teeth, creating pockets where bacteria collect and deepen the infection.
- Persistent bad breath: Chronic bad breath that doesn’t improve with brushing or mouthwash, caused by bacteria trapped in those deep pockets.
- Loose or shifting teeth: As the bone and connective tissue supporting the teeth break down, teeth may feel loose or your bite may start to feel different.
- Pus between teeth and gums: A clear sign of advanced infection.
Periodontitis involves permanent damage to the bone around your teeth. It requires professional treatment and cannot be reversed at home, though its progression can be stopped.
Hormonal Changes
Pregnancy is one of the most well-known triggers for gum bleeding. Rising levels of estrogen and progesterone increase blood flow to the gums and make the tissue more reactive to plaque bacteria. Pregnancy gingivitis affects 60% to 75% of pregnancies in the U.S. The bleeding often begins in the second trimester and usually resolves after delivery, but maintaining good oral hygiene throughout pregnancy limits its severity.
Puberty, menstruation, and menopause can cause similar changes on a smaller scale. If your gums bleed predictably around your period or started bleeding during a major hormonal shift, that’s likely a contributing factor.
Vitamin C Deficiency
Your gums need vitamin C to maintain the integrity of their blood vessels. A study published in the Journal of Dental Hygiene that pooled data from over 9,000 people found that low blood levels of vitamin C were associated with increased gum bleeding, even with gentle probing. In severe cases, vitamin C deficiency causes scurvy, where bleeding gums are a hallmark symptom.
Most adults need about 90 mg of vitamin C per day. If your diet is low in fruits and vegetables, increasing your intake of foods like oranges, bell peppers, kiwis, and kale can help. Harvard Health researchers suggest a daily supplement of 100 to 200 mg for people whose intake falls short.
Medications That Thin Your Blood
Blood-thinning medications reduce your body’s ability to clot, which can make gums bleed more easily or bleed longer than expected. Common culprits include aspirin, warfarin (Coumadin), clopidogrel (Plavix), and newer anticoagulants like apixaban (Eliquis) and rivaroxaban (Xarelto). If you’re taking any of these and notice new or increased gum bleeding, mention it to both your dentist and prescribing doctor. Do not stop taking these medications on your own, as they’re typically prescribed to prevent serious clotting events.
Dental Appliances and Mechanical Irritation
Ill-fitting dentures, retainers, or other dental appliances can rub against gum tissue repeatedly, creating sore spots that bleed. Braces can also make it harder to clean around the gumline effectively, leading to localized plaque buildup and inflammation. If bleeding consistently comes from one spot that lines up with where an appliance sits, the fit likely needs adjustment. A rough or broken filling edge can cause the same kind of localized irritation.
What to Do When Your Gums Bleed
For most people, the fix is straightforward: brush twice a day with a soft-bristled toothbrush, floss daily, and be consistent. The bleeding from mild gingivitis often improves within one to two weeks of a solid routine. Brushing too hard or using a hard-bristled brush can actually make things worse by damaging the tissue directly, so gentleness matters more than force.
If bleeding doesn’t improve after two weeks of consistent care, if it’s getting worse, or if you notice any signs of periodontitis like receding gums, loose teeth, or persistent bad breath, a dental visit is the next step. A professional cleaning removes hardened plaque (tarite) that you can’t remove at home, and your dentist can measure the depth of any pockets forming around your teeth to gauge how advanced the problem is.
When Bleeding Needs Urgent Attention
Most gum bleeding is slow, minor, and stops on its own. But if you have bleeding that won’t stop, press a moistened piece of gauze or a damp caffeinated tea bag (the tannins help constrict blood vessels) against the area and hold it firmly for 15 to 20 minutes. If the bleeding continues after that, or if it’s accompanied by severe pain, swelling, or signs of infection, you need same-day care from a dentist or emergency room.