Swollen gums can feel uncomfortable, tender, or alarming, especially if the swelling appears suddenly or affects one area around a tooth. The good news is that gum swelling is common, and many causes are treatable with the right care.
Sometimes the reason is simple, such as irritation from food, brushing too hard, or a dental appliance that does not fit well. Other times, swollen gums may point to gingivitis, gum disease, or an infection that needs prompt dental treatment. This guide explains common causes of swollen gums, what you can do at home, how dentists treat gum swelling, and when to call a dentist.
Why Are My Gums Swollen?
Gums swell when the tissue becomes inflamed, irritated, infected, or injured. The swelling may affect the entire gumline, several areas of the mouth, or one small spot around a tooth. Some people notice red swollen gums that bleed when brushing or flossing. Others may have puffy gums with little or no pain.
The pattern of swelling can offer clues about the cause. Swelling along the gumline may be related to plaque buildup or gingivitis. Swollen gums around one tooth may be caused by trapped food, irritation, a gum abscess, or a tooth infection. Gum swelling with bad breath, bleeding, loose teeth, pus, fever, or facial swelling should be taken seriously because those symptoms may signal a dental problem that needs professional care.
9 Common Causes of Swollen Gums
There is not one single reason gums become swollen. In many cases, more than one factor is involved. For example, plaque buildup may make the gums more sensitive, while a dental appliance, dry mouth, or hormonal changes may make irritation worse. The following are some of the most common causes.
Gingivitis
Gingivitis is one of the most common causes of swollen gums. It happens when plaque builds up along the gumline and irritates the gum tissue. Plaque is a sticky film that contains bacteria. If it is not removed with regular brushing, flossing, and professional cleanings, it can harden into tartar and become more difficult to remove at home.
Gingivitis may cause gums to look red, puffy, tender, or swollen. The gums may also bleed when you brush or floss. Gingivitis is often reversible when it is treated early. Better home care, daily flossing, and a professional dental cleaning can help remove plaque and tartar so the gum tissue can heal.
Periodontal Disease
If gingivitis is not treated, it can progress to periodontal disease, also called gum disease. Periodontal disease affects the gums, bone, and other structures that support the teeth. As gum disease advances, the gums may pull away from the teeth and form pockets where bacteria can collect.
Symptoms may include swollen gums, bleeding gums, gum recession, persistent bad breath, loose teeth, tooth sensitivity, or discomfort when chewing. Periodontal disease usually requires professional treatment. Depending on the severity, a dentist or periodontist may recommend a deep cleaning, ongoing periodontal maintenance, medication, or other gum disease care.
Food or Debris Stuck Under the Gumline
A small piece of food can sometimes become trapped under the gumline and cause localized swelling. Popcorn hulls, seeds, chips, and other small particles can irritate the tissue around one tooth. This may cause tenderness, redness, or a swollen spot that seems to appear quickly.
Gentle brushing, flossing, or rinsing may help remove the debris. Do not dig aggressively into the gums with sharp objects, because that can make the irritation worse or injure the tissue. If the swelling does not improve after gentle cleaning, or if the area becomes painful, a dentist should check it.
Dental Abscess or Infection
Swelling around one tooth can sometimes be a sign of a dental abscess or infection. This is especially concerning if the swelling comes with throbbing pain, pus, a bad taste, fever, facial swelling, or tenderness when biting. A dental infection should not be ignored because it may spread beyond the tooth or gum area.
A suspected abscess needs prompt dental evaluation. Treatment depends on the source of the infection and may involve draining the abscess, treating the tooth, prescribing medication, or recommending additional dental care. If gum swelling is accompanied by facial swelling, fever, trouble swallowing, or trouble breathing, seek urgent care right away.
Poorly Fitting Dental Appliances
Dentures, partial dentures, retainers, braces, clear aligners, and night guards can all irritate gum tissue if they do not fit properly. An appliance that rubs in one area may cause soreness, swelling, or a small ulcer. Braces or retainers can also trap food and plaque, which may increase the risk of inflamed gums.
A dentist can check whether the appliance needs to be adjusted, repaired, cleaned, or replaced. If you wear dentures or a night guard, do not keep using an appliance that causes ongoing sores or swelling without having it checked. Irritated tissue can worsen over time, and a sore area may become more vulnerable to infection.
Hormonal Changes
Hormonal changes can make gums more sensitive to plaque and irritation. This can happen during pregnancy, menstrual cycles, puberty, or other hormonal shifts. During pregnancy, some people develop swollen or bleeding gums even when their home care routine has not changed much.
Good oral hygiene is especially important during these times. Brushing gently twice a day, flossing daily, and keeping up with dental cleanings can help reduce inflammation. If you are pregnant and your gums are swollen, bleeding, or uncomfortable, tell your dentist. Dental care is an important part of overall health during pregnancy.
Medication Side Effects
Some medications can contribute to gum swelling, gum overgrowth, or dry mouth. Dry mouth can increase irritation because saliva helps wash away food particles and bacteria. Certain medicines may also make gum tissue more likely to enlarge or become inflamed.
Do not stop taking a prescription medication on your own because of swollen gums. Instead, tell both your dentist and medical provider. They can review your medications, look for possible oral side effects, and discuss options. Your dentist may also recommend more frequent cleanings or a home care plan to help manage gum changes.
Vitamin Deficiencies or Dry Mouth
Nutrition and saliva both play a role in oral health. Low levels of certain nutrients, including vitamin C or some B vitamins, may contribute to gum tenderness, bleeding, or irritation. Dry mouth can also make the gums and mouth tissues more vulnerable to soreness because there is less saliva to help protect the mouth.
Dry mouth may be related to medications, dehydration, mouth breathing, tobacco use, certain medical conditions, or cancer treatment. If your mouth often feels dry, sticky, or uncomfortable, ask your dentist about possible causes. Treatment may include hydration, saliva substitutes, changes to oral hygiene products, or coordination with your medical provider.
Injury, Burns, or Irritation
Gums can swell after an injury or irritation. Hot foods or drinks can burn the tissue. Aggressive brushing, hard-bristled toothbrushes, tobacco, vaping, whitening products, acidic foods, or harsh mouth rinses can irritate the gums. The swelling may be mild and temporary if the cause is removed quickly.
Switching to a soft-bristled toothbrush, brushing gently, and avoiding the irritating product or food may help. However, if swelling persists, worsens, or is accompanied by pain, bleeding, sores or pus, a dentist should evaluate the area.
How to Treat Swollen Gums at Home
Home care may help when gum swelling is mild and clearly related to irritation, plaque buildup, or a temporary trigger. Start with gentle brushing twice a day using a soft-bristled toothbrush. Brush along the gumline carefully, but do not scrub hard. Daily flossing can help remove plaque and food particles between teeth, where a toothbrush cannot reach.
Warm saltwater rinses may soothe irritated gums. Mix a small amount of salt into a cup of warm water, swish gently, and spit it out.
Avoid tobacco and vaping, which can irritate oral tissues and contribute to gum disease. It can also help to avoid very hot, spicy, acidic, or crunchy foods until the gums feel better.
Home care is not a substitute for dental treatment if infection is suspected. If swelling is severe, affects one tooth, produces pus, causes significant pain, or does not improve after a few days, schedule a dental visit.
When to See a Dentist for Swollen Gums
You should see a dentist if swollen gums last more than a few days, keep coming back, or affect one specific tooth. You should also schedule care if swelling comes with bleeding, persistent bad breath, pain when chewing, gum recession, loose teeth, or a change in how your bite feels.
Some symptoms require prompt attention. Call a dentist as soon as possible if you notice pus, throbbing pain, swelling around one tooth, or worsening symptoms. Seek urgent medical or dental care if gum swelling is accompanied by fever, facial swelling, trouble swallowing, or trouble breathing. These symptoms may indicate that an infection is spreading.
How Dentists Treat Swollen Gums
Treatment depends on the cause of the swelling. If plaque and tartar are causing gingivitis, a professional cleaning and improved home care may be enough to help the gums recover. If periodontal disease is present, your dentist may recommend a deep cleaning, periodontal maintenance, or referral to a gum specialist.
If swelling is caused by a dental appliance, the dentist may adjust the denture, retainer, braces, or night guard so it no longer rubs the gums. If an infection or abscess is suspected, the dentist may take X-rays, examine the tooth and gums, drain the infection if needed, treat the source of the infection, or prescribe medication. If dry mouth, medication side effects, or nutrition may be contributing to the problem, your dentist may coordinate with your medical provider.
How to Prevent Swollen Gums
The best way to prevent many causes of swollen gums is to keep plaque under control. Brush twice a day with a soft-bristled toothbrush and fluoride toothpaste. Floss daily to clean between the teeth and under the gumline. If floss is difficult to use, ask your dentist whether interdental brushes, floss picks, or a water flosser may be appropriate.
Regular dental cleanings are also important because tartar cannot be removed with brushing and flossing alone. Treat cavities, gum disease, and appliance problems early instead of waiting for symptoms to get worse. Replace toothbrushes regularly, manage dry mouth, avoid tobacco, and do not ignore bleeding gums. Bleeding may be common, but it is not something to dismiss if it keeps happening.