By Dr. Manish Pandey, BDS, Dental Surgeon
Last medically reviewed: October 2, 2026
Quick answer: Swollen gums most often result from plaque-related inflammation, but swelling can also occur around a trapped piece of food, an erupting wisdom tooth, a dental abscess, braces, hormonal changes, medicines or another health condition. Gentle oral hygiene may settle mild inflammation, but swelling that is painful, localised to one tooth, produces pus, or occurs with fever or facial swelling needs prompt dental assessment.
“Swollen gums” describes a symptom, not a diagnosis. The pattern matters: puffiness throughout the mouth suggests a different set of causes from a small lump beside one tooth. This guide explains what those patterns may mean, how to relieve swollen gums safely, and when waiting is not appropriate.
What do swollen gums look and feel like?
Healthy gums are usually firm and fit closely around the teeth. Inflamed gums may look redder or darker than usual, feel puffy or tender, and bleed during brushing or interdental cleaning. The gum margin can appear rounded rather than sharp, and the tissue between teeth may look enlarged.
Other clues include persistent bad breath, an unpleasant taste, gum recession, pain while chewing or teeth that feel loose. Because early gum disease may cause little pain, appearance and bleeding can be more noticeable than soreness.
Common causes of swollen gums
The most common cause is gingivitis. Dental plaque is a sticky bacterial film that continually forms on teeth. When it remains along the gumline, the body’s inflammatory response can make the gums red, swollen and prone to bleeding. Plaque can harden into tartar, which cannot be removed with a toothbrush and requires professional cleaning.
Gingivitis is generally reversible when plaque and tartar are controlled. It does not cause the bone loss associated with periodontitis. Read our detailed guide to gingivitis symptoms and treatment for the distinction between these conditions.
Food trapped between teeth
A fibrous piece of food lodged between teeth can irritate the gum and cause local tenderness. Gently clean the area with floss or an appropriately sized interdental brush. Do not dig at the gum with a pin, fingernail or wooden toothpick. Recurrent trapping in the same place may indicate a loose filling, a gap between teeth, decay or gum disease and deserves an examination.
Swollen gum around one tooth
Swelling limited to one tooth can come from local gingivitis, trapped food, decay, a cracked tooth or an infection arising from the tooth or surrounding gum. A pimple-like bump, pus, throbbing pain, pain on biting or a bad taste raises concern for an abscess.
An abscess does not reliably heal without dental treatment. Even if it drains and the pressure eases, the source of infection may remain. Do not place aspirin on the gum or start leftover antibiotics; both can cause harm, and antibiotics alone do not remove the dental cause.
Swollen gums at the back of the mouth
Inflammation around a partly erupted wisdom tooth is called pericoronitis. A flap of gum may trap plaque and food around the back molar, causing soreness, swelling, a bad taste or difficulty opening the mouth. A dentist may clean the area, assess the tooth’s position and discuss whether further treatment is needed.
Urgent assessment is important if pain or swelling is worsening, the face is swelling, you feel feverish, or swallowing and mouth opening become difficult.
Braces, dentures and difficult-to-clean areas
Brackets, wires, retainers, bridges and removable dentures can create areas where plaque accumulates. Poorly fitting appliances may also rub the gums. Careful cleaning around appliances and professional adjustment can help. Do not stop wearing a prescribed appliance without asking the treating dentist or orthodontist unless it is causing an immediate injury.
Hormonal changes
Puberty, pregnancy and other hormonal changes can make gum tissue respond more strongly to plaque. Pregnancy does not make gum bleeding or swelling something to ignore; good daily cleaning and appropriate dental care remain important. SmilesCare has a separate guide to swollen gums during pregnancy.
Medicines and gum enlargement
Some medicines can contribute to enlarged gum tissue, including certain antiseizure medicines, calcium-channel blockers and immune-suppressing drugs. The risk and severity vary, and plaque can worsen the inflammation around enlarged tissue.
Do not stop or change a prescribed medicine on your own. Ask your dentist and prescriber to review the swelling, cleaning challenges and possible alternatives. Professional cleaning and a tailored home-care plan may reduce inflammation even when the medicine cannot be changed.
Less common causes
Vitamin deficiencies, blood disorders, immune-mediated disease, allergic or irritant reactions and some infections can affect the gums, but they are less common than plaque-related inflammation. Persistent swelling that does not match the amount of plaque, or swelling accompanied by unusual bruising, marked fatigue, recurrent ulcers, skin or eye symptoms, should be assessed rather than self-diagnosed.
Why are my gums swollen and bleeding?
Swelling and bleeding together commonly point to gingival inflammation. Bleeding that happens repeatedly during gentle brushing or flossing is not considered a sign of healthy gums. It may improve as plaque is removed consistently, but aggressive scrubbing can injure tissue and is not the answer.
Our article on why gums bleed explains additional causes and cleaning technique. Contact a dentist if bleeding is persistent, spontaneous, heavy, or accompanied by unexplained bruising or other symptoms.
How to relieve swollen gums safely
Home care can support mild plaque-related inflammation, but it cannot diagnose the cause or remove hardened tartar, repair a damaged tooth or cure an abscess.
- Brush gently twice a day. Use fluoride toothpaste and a soft-bristled brush. Angle the bristles toward the gumline without forceful scrubbing.
- Clean between teeth daily. Use floss or an interdental brush that fits without being forced. A dental professional can recommend the right size and technique.
- Rinse with warm salt water for short-term comfort. A mild rinse may soothe irritated tissue, but do not swallow it and do not use concentrated salt solutions.
- Avoid tobacco and vaping. Tobacco increases periodontal risk and can interfere with healing.
- Choose comfortable foods. If chewing is sore, avoid very hard, sharp, spicy or extremely hot foods temporarily while arranging care.
- Use pain medicine only if it is safe for you. Follow the label and ask a pharmacist if you have medical conditions, take other medicines, are pregnant or are unsure what is suitable.
Mouthwash is not a substitute for brushing and interdental cleaning. A dentist may recommend an antiseptic rinse for selected situations, but long or inappropriate use can stain teeth, alter taste or irritate tissues. Avoid undiluted peroxide, essential oils, bleach, alcohol, aspirin on the gum and other DIY “cures.”
When should swollen gums be checked?
Arrange a dental appointment if swelling lasts more than several days, repeatedly returns, bleeds often, causes persistent bad breath, or makes cleaning uncomfortable. Earlier assessment is sensible if swelling is limited to one tooth, there is a lump or gum boil, a tooth hurts when biting, or you have diabetes, are pregnant, smoke, take medicines associated with gum enlargement, or have a weakened immune system.
Seek urgent dental care for severe or rapidly increasing pain or swelling, pus, fever, a loose tooth, facial swelling, difficulty opening the mouth, or swelling around a wisdom tooth with worsening symptoms.
Seek emergency medical help if swelling affects breathing or swallowing, spreads into the neck or around the eye, or is accompanied by severe illness. Sudden swelling of the lips, tongue or throat after a medicine, food or dental material may be an allergic emergency.
How a dentist finds the cause
The dentist will ask when the swelling began, whether it affects one area or the whole mouth, and whether there is pain, bleeding, discharge, fever or a recent change in medicines. They will examine the teeth and gums, look for plaque and tartar, and may use a periodontal probe to measure the spaces around teeth.
Dental X-rays may be needed when decay, bone loss, an abscess or the position of a wisdom tooth is suspected. Treatment depends on the diagnosis and may include cleaning, oral-hygiene instruction, repair or treatment of a tooth, drainage of infection, adjustment of an appliance, periodontal therapy or referral to another clinician. Antibiotics are reserved for specific indications and are not routine treatment for simple gingivitis.
Frequently asked questions
Why is my gum swollen around only one tooth?
Common possibilities include trapped food, local plaque buildup, decay, a cracked tooth or an abscess. Gently clean between the teeth, but arrange an examination if swelling persists, is painful, produces pus or is associated with pain on biting.
Can swollen gums go away on their own?
Mild irritation may settle after the trigger is removed and cleaning improves. Plaque-related gingivitis can improve with effective daily care and professional removal of tartar. An abscess, damaged tooth, poorly fitting appliance or medicine-related enlargement needs cause-specific care.
How long do swollen gums take to heal?
There is no single timeline. Improvement from mild gingivitis may begin after plaque is controlled, but tartar, deeper gum disease and dental infection will not resolve through brushing alone. Lack of improvement after several days of careful cleaning is a reason to book an assessment.
Should I floss swollen gums?
Gentle interdental cleaning is usually important when plaque-related inflammation is present. Do not snap floss into the tissue or force an oversized brush between teeth. If one area is very painful, bleeds heavily or has a lump, ask a dentist how to clean it safely.
Are swollen gums always gingivitis?
No. Gingivitis is common, but local infection, wisdom-tooth inflammation, trauma, appliances, hormonal changes, medicines and less common medical conditions can also cause swelling. The distribution and accompanying symptoms guide the diagnosis.
The bottom line
Swollen gums are often an early sign that plaque is irritating the gumline, but a painful swelling around one tooth or at the back of the mouth needs closer attention. Clean gently, avoid harsh home remedies and arrange dental care when swelling persists or comes with pain, pus, fever, facial swelling or difficulty swallowing.
This article provides general dental education and cannot diagnose the cause of gum swelling. An in-person examination is necessary when symptoms persist, worsen or include warning signs.
Sources
- National Institute of Dental and Craniofacial Research: Periodontal (Gum) Disease
- National Institute of Dental and Craniofacial Research: Oral Hygiene
- NHS: Gum Disease
- American Dental Association: Dental Floss and Interdental Cleaners