Swollen gums are almost always a sign of inflammation, and the most common cause is plaque buildup along the gumline. The good news: mild gum swelling is reversible with the right care at home and, if needed, a professional cleaning. About 4 in 10 U.S. adults over 30 have some level of gum disease, so this is one of the most common dental problems you can run into.
What matters most is figuring out whether your swelling is a minor irritation you can manage yourself or something that needs professional attention. Here’s how to sort that out and what to do either way.
Start With a Salt Water Rinse
The simplest thing you can do right now is rinse with warm salt water. Mix half a teaspoon of salt into 8 ounces of warm water, swish it around your mouth for 30 to 60 seconds, and spit. Salt water draws fluid out of inflamed tissue, which reduces swelling and helps control bacteria. You can do this two to four times per week, or more frequently for a few days if the swelling is fresh.
A diluted hydrogen peroxide rinse is another option. Combine equal parts 3% hydrogen peroxide (the standard brown bottle from the drugstore) and water to make a 1.5% solution. Swish for 30 to 60 seconds, but don’t exceed 90 seconds, and don’t swallow it. This kills bacteria and can help with inflammation, though salt water is gentler for everyday use.
Improve Your Brushing and Flossing
Swollen gums usually mean plaque is irritating the tissue right at the gumline. Brushing twice a day with a soft-bristled toothbrush and flossing once daily is the most effective way to reverse early gum inflammation. If your gums bleed when you floss, that’s actually a reason to keep flossing, not to stop. Bleeding typically decreases within a week or two as the tissue heals.
Angle your toothbrush at about 45 degrees toward the gumline so the bristles sweep under the edge of the gum. An electric toothbrush can make this easier. Be thorough but gentle. Aggressive scrubbing with a hard-bristled brush can damage gum tissue and make swelling worse.
Figure Out What’s Causing It
The cause of your swelling determines whether home care will be enough or whether you need a dentist involved.
Gingivitis
This is the most common cause. Gingivitis is mild gum disease caused by plaque irritation. It typically shows up as red, puffy gums that bleed when you brush or floss. It often causes no pain at all, which is why people sometimes ignore it. The key thing to know: gingivitis is fully reversible. Better oral hygiene at home and a professional cleaning can clear it up completely.
Periodontitis
If gingivitis goes untreated, it can progress to periodontitis, a more serious form of gum disease. At this stage, the gums start pulling away from the teeth, forming pockets that trap bacteria. Over time, the infection damages the bone that holds your teeth in place. Signs include persistent bad breath, receding gums, sensitive or loose teeth, and pain when chewing. Periodontitis is not reversible at home. You’ll need professional treatment to stop it from getting worse.
Hormonal Changes
Pregnancy is a well-known trigger for swollen gums. Rising levels of estrogen and progesterone increase blood flow to gum tissue, making it more sensitive to plaque. Even a normal amount of plaque can trigger inflammation that wouldn’t have bothered you before. Pregnancy gingivitis is common and usually temporary, but you should still keep up with dental cleanings during pregnancy to prevent it from progressing.
Puberty, menstruation, and menopause can cause similar hormonal shifts that affect gum sensitivity.
Medications
Certain medications cause gum overgrowth as a side effect. The most common culprits are anti-seizure drugs (like phenytoin and carbamazepine), blood pressure medications in the calcium channel blocker family (like nifedipine, amlodipine, and diltiazem), and the immunosuppressant cyclosporine. If your gum swelling started after beginning a new medication, mention it to your dentist and prescribing doctor. A medication change may help.
Vitamin Deficiencies
Vitamin C plays a direct role in maintaining healthy gums. A severe deficiency, known as scurvy, causes gums to become swollen, spongy, and purple, and can eventually lead to tooth loss. This is rare in developed countries but can happen in people with very restricted diets. With vitamin C supplementation, symptoms typically begin improving within 24 to 48 hours, though gum damage may take weeks or months to fully resolve. Severe gum disease from prolonged deficiency can cause permanent damage.
When Swollen Gums Need Urgent Attention
Most gum swelling is not an emergency, but a dental abscess is. An abscess is a pocket of infection that can form at the root of a tooth or in the gum tissue. The warning signs are distinct: severe, constant, throbbing pain that may radiate to your jaw, neck, or ear. You might also notice a fever, facial swelling, or a sudden rush of foul-tasting fluid in your mouth (which means the abscess ruptured).
If you have a fever with facial swelling and can’t reach your dentist, go to an emergency room. Difficulty breathing or swallowing with gum or facial swelling is a sign the infection may be spreading deeper into your jaw or throat, and that needs immediate care.
What a Dentist Will Do
For gingivitis, a standard professional cleaning is usually enough. Your hygienist removes plaque and hardened tarite (calculus) that you can’t get off with a toothbrush alone, especially below the gumline.
For periodontitis, the standard first-line treatment is a deep cleaning called scaling and root planing. This involves cleaning below the gumline and smoothing the root surfaces so the gums can reattach more tightly to the teeth. It’s done with local anesthesia, requires no incisions or stitches, and most people return to normal activities the same day. Your gums may feel sore for a couple of days afterward, but over-the-counter pain relievers handle it. The American Dental Association recommends this procedure as the initial nonsurgical treatment for periodontitis based on its moderate but consistent benefits.
In some cases, your dentist may place a small medicated chip in the gum pockets or prescribe a low-dose oral medication to help control the infection alongside the deep cleaning.
Keeping Swelling From Coming Back
Once you’ve gotten your gums back to a healthy state, prevention is straightforward but requires consistency. Brush twice daily, floss once daily, and get professional cleanings on whatever schedule your dentist recommends (typically every six months, or more often if you’ve had periodontitis).
Smoking is one of the biggest risk factors for gum disease and makes treatment less effective. If you smoke, quitting will improve your gum health more than almost any other single change. Eating enough fruits and vegetables covers your vitamin C needs without supplements. Managing blood sugar matters too, since diabetes significantly increases the risk of gum disease and slows healing.
If you notice your gums starting to look puffy or bleed again, don’t wait. Early gum inflammation responds quickly to better home care and a cleaning. The longer you let it go, the harder it is to reverse.