Swollen gums are almost always a sign of inflammation, most commonly from bacterial plaque buildup along the gumline. The good news: mild cases usually respond well to better oral hygiene at home within one to two weeks. If swelling persists, worsens, or comes with fever or pus, you’re dealing with something that needs professional care.
Why Gums Swell in the First Place
Your gums swell when your immune system reacts to bacteria living in the sticky film (plaque) that collects on your teeth. When that plaque sits undisturbed, especially near the gumline, it shifts from harmless bacteria to disease-associated species that trigger a strong inflammatory response. Your body floods the area with immune cells, which causes the redness, puffiness, and tenderness you feel.
If plaque hardens into tarite (calcified deposits your toothbrush can’t remove), the irritation becomes constant. That’s the progression from gingivitis, the mild and reversible stage, to periodontitis, which can damage the bone supporting your teeth. Catching it early makes all the difference.
What You Can Do at Home
Start with the basics: brush twice a day for two full minutes and floss once daily. If your gums bleed when you floss, that’s a sign of inflammation, not a reason to stop. Gentle, consistent flossing typically reduces bleeding within a week or two as the tissue heals.
A saltwater rinse can calm swollen gums between brushings. Mix 1 teaspoon of salt into 8 ounces of warm water and swish for 30 seconds. If that feels too strong, drop to half a teaspoon. Do this two to three times a day, especially after meals. Salt draws fluid out of swollen tissue and creates an environment that’s less friendly to bacteria.
Over-the-counter numbing gels containing benzocaine (available in 10% and 20% concentrations) can temporarily relieve pain from sore, inflamed gums. These are meant for short-term use while you address the underlying cause. An anti-inflammatory pain reliever like ibuprofen can also help reduce swelling and discomfort.
If you’re using a manual toothbrush, consider switching to an oscillating-rotating electric brush. A meta-analysis comparing toothbrush technologies found that oscillating-rotating brushes reduced bleeding sites by 52% more than manual brushes. That’s a significant edge for something you’re already doing every day. Use a soft-bristled head and let the brush do the work rather than pressing hard, which can irritate gums further.
Causes Beyond Poor Brushing
Hormonal Changes During Pregnancy
Pregnancy gingivitis is extremely common. Rising estrogen and progesterone levels increase blood flow to the gums and change how sensitive your tissue is to plaque. Even women who’ve never had gum problems may notice swelling, tenderness, and bleeding during pregnancy. The condition typically resolves after delivery, but keeping up with dental cleanings during pregnancy helps prevent it from getting worse.
Diabetes and Blood Sugar
High blood sugar feeds the bacteria in your mouth directly. Elevated glucose shows up in your saliva, giving harmful bacteria extra fuel to produce plaque. Diabetes also reduces saliva production in some people, and that drier environment lets plaque and tartar build up faster. According to the National Institute of Diabetes and Digestive and Kidney Diseases, high blood glucose levels increase the risk that mild gum disease will progress to severe disease. If you have diabetes and notice persistent gum swelling, tighter blood sugar control is part of the treatment.
Vitamin C Deficiency
A severe lack of vitamin C over at least three months can cause scurvy, which produces swollen, bleeding gums that turn purple and spongy. This is rare in developed countries but does occur in people with very restricted diets, older adults with poor nutrition, or those with absorption issues. Adults need about 75 to 90 milligrams of vitamin C daily from food to prevent deficiency. If scurvy is diagnosed, supplemental doses of 500 to 1,000 milligrams daily can reverse the symptoms.
Medications That Cause Gum Overgrowth
Certain medications cause the gums to physically enlarge, a condition called gingival hyperplasia. The most common culprits fall into three categories: seizure medications (particularly phenytoin), blood pressure medications in the calcium channel blocker family (nifedipine causes it in roughly 38% of users, diltiazem in about 20%), and the immunosuppressant cyclosporine, which triggers overgrowth in 13 to 85% of patients depending on the study. If your gums began swelling after starting a new medication, bring it up with your prescribing doctor. Switching to a different drug in the same class often helps.
When You Need Professional Treatment
If home care hasn’t improved your swelling within two weeks, or if your gums are pulling away from your teeth, it’s time for a dental visit. Your dentist may recommend scaling and root planing, a deep cleaning that removes plaque and tartar from below the gumline and smooths the root surfaces so gums can reattach.
The procedure is straightforward. Most people return to normal activities the same day. Expect some gum tenderness for a couple of days and mild tooth sensitivity that fades within a month or two. Your teeth may feel slightly loose immediately after because the swollen tissue that was gripping them has been cleared away, but this resolves as the gums heal and tighten back up.
Signs of a Dental Emergency
Most gum swelling is not dangerous, but certain symptoms signal an infection that needs urgent care. Watch for fever, swollen lymph nodes under your jaw or along your neck, or a sudden burst of foul-tasting salty fluid in your mouth (which means an abscess has ruptured). If you develop facial swelling along with a fever and can’t reach your dentist, go to an emergency room. Difficulty breathing or swallowing with gum swelling is especially serious, as it can indicate the infection has spread into your jaw, throat, or deeper tissues.