The most common reason gums swell is a buildup of plaque, the sticky bacterial film that forms on teeth after eating. When plaque sits on your teeth long enough, it irritates the surrounding gum tissue and triggers inflammation. But plaque isn’t the only culprit. Hormonal shifts, certain medications, nutritional deficiencies, and underlying health conditions can all cause your gums to puff up.
How Plaque Causes Gum Swelling
Every time you eat foods containing sugars or starches, bacteria in your mouth form a colorless, sticky layer on your teeth. That’s plaque. If it isn’t brushed away, plaque hardens under the gumline into tartar (also called calculus), which acts like a shield for bacteria and can’t be removed by brushing alone. The longer plaque and tartar sit against your gums, the more irritated the tissue becomes.
What’s actually happening inside the tissue is an immune response. Your body detects bacterial toxins leaking from the plaque and sends waves of immune cells to the area. Those cells release inflammatory signals that recruit even more immune cells, creating a cycle of swelling, redness, and tenderness. This is your body trying to fight the bacteria, but the inflammation itself damages the gum tissue in the process. The result is gums that look puffy, feel tender, and bleed when you brush or floss.
Other Common Causes
Plaque buildup leads to gingivitis, which is by far the most frequent explanation. But several other factors can cause or worsen gum swelling, even if your brushing habits are decent.
- Hormonal changes. Pregnancy, puberty, menstruation, and menopause all shift levels of estrogen and progesterone. Gum tissue has receptors for both hormones, and elevated levels increase blood flow to the gums while making them more sensitive to plaque. During pregnancy specifically, these hormonal shifts can cause noticeable gum swelling and bleeding even with regular brushing.
- Medications. Some drugs used for epilepsy, high blood pressure, and chest pain are known to cause gum overgrowth as a side effect. If your gums started swelling after beginning a new medication, that connection is worth exploring with your prescriber.
- Vitamin C deficiency. Vitamin C is essential for building and repairing connective tissue, including the tissue in your gums. Without enough of it, gums can become swollen, spongy, and purple, and they bleed easily. This is the hallmark of scurvy, which is rare but still occurs in people with very limited diets.
- Dental infections. An abscessed tooth, where a pocket of pus forms around the root or inside the tooth, causes localized gum swelling that can be quite painful. A cracked tooth root can produce similar symptoms.
- Oral appliances. Braces, retainers, and ill-fitting dentures can irritate the gums mechanically, creating swelling along the gumline where the appliance presses against tissue.
- Immune-suppressing conditions. Diseases like diabetes, leukemia, and HIV reduce your body’s ability to fight oral bacteria, making gum inflammation more likely and harder to resolve.
- Tobacco use. Smoking or chewing tobacco irritates gum tissue directly and weakens your immune response, making infections more likely to take hold.
When Swollen Gums Are Actually Gum Disease
Gingivitis is the mildest form of gum disease. Gums turn red, swell, and bleed easily, but there’s usually little or no pain. The good news is that gingivitis is fully reversible with professional cleaning and better home care. Most mild cases improve within 10 to 14 days once you start a consistent routine of brushing, flossing, and keeping follow-up appointments.
If gingivitis goes untreated, it can progress to periodontitis, which is a different situation entirely. In periodontitis, plaque spreads below the gumline, and the chronic inflammatory response starts breaking down the bone and tissue that hold your teeth in place. The gums pull away from the teeth, forming deep pockets that trap more bacteria and become infected. As those pockets deepen, teeth loosen and can eventually fall out. Unlike gingivitis, the bone loss from periodontitis is not reversible. It can only be managed to prevent further damage.
What Treatment Looks Like
For gum swelling caused by plaque and tartar buildup, the standard first-line treatment is scaling and root planing, often called a deep cleaning. During the procedure, a dentist or hygienist numbs your gums with local anesthesia, then removes plaque and tartar from both above and below the gumline using hand instruments or ultrasonic tools. They also smooth the surfaces of your tooth roots so bacteria have fewer places to cling. The whole process takes one to two hours and may be split across two visits.
Recovery is straightforward. 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. You don’t need stitches, and you can eat and drink normally as long as nothing causes discomfort. In some cases, your provider may also prescribe antibiotics to clear lingering infection.
Ideally, you only need a deep cleaning once. After the tartar and bacteria are removed, regular dental cleanings every six months, combined with daily brushing and flossing, should keep your gums healthy going forward.
Why Gum Health Affects the Rest of Your Body
Swollen gums aren’t just an oral health problem. The bacteria thriving in inflamed gum tissue can enter your bloodstream and travel to other parts of your body. Reducing the bacterial load in your mouth through deep cleaning and daily care has benefits beyond your teeth, lowering the overall burden of harmful bacteria circulating through your system. Chronic gum disease has been linked to increased risk of cardiovascular problems, poorly controlled blood sugar in diabetics, and complications during pregnancy.
Signs That Need Urgent Attention
Most gum swelling improves with better hygiene or professional cleaning. But certain symptoms alongside swollen gums signal a more serious infection that needs immediate care: a fever of 100.4°F (38°C) or higher, swelling that spreads to your face or jaw, difficulty swallowing, a rapid heartbeat, or confusion. These can indicate a dental abscess that has spread beyond the tooth, and they warrant a trip to the emergency room rather than waiting for a dental appointment.