By Alexander Angeloff, founder of TranscenDental. We make toothpaste and floss, so we have a stake in how you care for your gums; we've tried to present the evidence fairly. Educational content, not medical advice.
Your gum feels puffy when you run your tongue over it. Maybe it's one spot next to a back tooth, maybe it's the whole gumline. Swollen gums are common, and most of the time the cause is simple. But the right next step depends a lot on where the swelling is and what comes with it.
The short answer: swollen gums are most often caused by gingivitis, inflammation from plaque left along the gumline, and usually calm down within one to two weeks of gentle brushing, daily cleaning between your teeth and warm saltwater rinses. Swelling around just one tooth is more often something local, like trapped food, an abscess or an erupting wisdom tooth. See a dentist if swelling lasts longer than two weeks, a bump appears, or it's very painful, and get urgent care if swelling spreads to your face or you have a fever or trouble swallowing or breathing.
What I brush with every day
What causes swollen gums
Healthy gums are pale pink, firm and fit snugly around each tooth. Swollen gums look puffy, red or even purplish, sometimes shiny and smooth, and they often feel tender or bleed when you brush. Cleveland Clinic names inflammation, most often gingivitis, as the usual reason (Cleveland Clinic).
Gingivitis is the earliest stage of gum disease. The US National Institute of Dental and Craniofacial Research describes its signs as red, swollen, tender gums that bleed easily, and notes that early gum disease caused by plaque "can often be reversed" with daily brushing and flossing (NIDCR). If plaque hardens into tartar and inflammation moves deeper, it can become periodontitis, which damages the bone and tissue that hold teeth in place.
A useful first question is whether the swelling is all over or in one spot. The two patterns tend to have different causes.
| Pattern | Common causes | What usually helps |
|---|---|---|
| Along the whole gumline | Gingivitis from plaque; hormone changes (pregnancy, puberty, menopause); braces; some medications; irritation from a toothpaste or mouthwash; low vitamin C | Better daily cleaning, a professional cleaning, and checking medications, diet and products |
| Around one tooth | Food wedged under the gum; a gum or tooth abscess; a cracked tooth or root; a deep cavity; a crown or filling edge that traps plaque | Gently clearing the area; a dental exam if it doesn't settle in a few days |
| Behind the last molar | Pericoronitis around a partly erupted wisdom tooth; trapped food; in children, a molar coming in | Careful cleaning and rinsing; a dental visit, sooner if it's painful or you can't open your mouth fully |
Causes of swelling all over
- Plaque and gingivitis. By far the most common. Swelling is often worst between the teeth and along the gumline, where a brush misses plaque.
- Pregnancy. The ADA, citing the CDC, says about 60% to 75% of pregnant women have gingivitis (ADA News). Rising estrogen and progesterone increase blood flow to the gums, so they react more strongly to the same amount of plaque. Puberty and menopause can shift gum health too.
- Braces and appliances. Plaque collects around brackets and wires, and dentures that don't fit can rub and irritate the gums.
- Certain medications. Some anti-seizure drugs (such as phenytoin), immunosuppressants (such as cyclosporine) and calcium channel blockers used for blood pressure are known to cause gum overgrowth, and good plaque control is a big part of managing it (Thompson et al., 2004, Journal of Dental Hygiene). Never stop a medicine on your own; ask your doctor and dentist.
- A product you're reacting to. MedlinePlus lists sensitivity to toothpaste or mouthwash as a cause, and suggests switching brands if you suspect one (MedlinePlus).
- Nutrition. Vitamin C and B vitamin deficiencies are on Cleveland Clinic's list. Low vitamin C is linked to gums that bleed easily; we cover that research in our post on bleeding gums when brushing.
- Infections and medical conditions. Viral infections such as oral herpes, fungal infections such as thrush, and diabetes can all show up in the gums.
Swollen gum around one tooth
When only one spot is swollen, think local first. These are the usual suspects:
- Something stuck. A popcorn hull, a seed or a sliver of chip can wedge under the gum and set off swelling within a day. Cleveland Clinic and MedlinePlus both name food caught under the gumline as a cause.
- A gum or tooth abscess. A pocket of pus from a bacterial infection, either in the gum next to a tooth or at the root of a tooth. Signs include throbbing pain, a pimple-like bump on the gum, a bad taste, a tender or loose tooth, and sometimes fever or facial swelling. An abscess will not go away on its own (HSE).
- A cracked tooth or root. A crack that runs toward the root can let bacteria in and cause swelling right next to that tooth.
- A deep cavity. Decay that reaches the nerve can lead to infection and swelling.
- A dental restoration. A crown or filling with a rough or overhanging edge can trap plaque in one place.
If you can see or feel something stuck, gently work floss down both sides of the tooth and rinse with warm salt water. If the swelling hasn't eased within a couple of days after the area is clean, or there's a bump, pus or throbbing pain, see a dentist. An abscess needs drainage or treatment of the tooth, and painkillers only cover the symptoms.
A swollen gum around one tooth with no pain is still worth a look if it lasts. Some infections drain through the gum and stop hurting, which can make them easy to ignore.
Swollen gums in the back of the mouth
Swelling behind or around the last molar is so common that it has its own name: pericoronitis, an infection of the gum flap over a partly erupted wisdom tooth. Food and bacteria get trapped under the flap, which is hard to reach with a toothbrush. Guy's and St Thomas' NHS Foundation Trust calls it the most common reason wisdom teeth are removed, seen in up to 6 in 10 patients their clinic treats for wisdom tooth problems (Guy's and St Thomas').
Typical signs are pain and swelling at the back of the jaw, a bad taste, and sometimes difficulty opening your mouth fully. Mild flare-ups may settle with careful cleaning and rinsing, but because they tend to come back, a dentist should check the tooth. Trouble opening your mouth, swelling in your cheek or jaw, or fever means you should be seen promptly.
Other causes at the back include food packed between the last two molars and, in children and teens, molars coming in. In babies, puffy gums are usually teething.
What I brush with every day
10% nano-hydroxyapatite, organic birch xylitol and 2% theobromine in a probiotic herbal ferment. No fluoride, SLS or glycerin.
How to get swollen gums to go down at home
These steps are for ordinary swelling from irritated or inflamed gums. They aren't a substitute for treatment if you have signs of an abscess or infection (see the next sections).
- Keep brushing, gently. It's tempting to avoid a sore area, but plaque left there keeps the inflammation going. Use a soft brush angled toward the gumline with small, light strokes.
- Clean between your teeth once a day. Slide floss down the side of each tooth and curve it around the tooth rather than snapping it into the gum. Expect a little bleeding for the first few days.
- Rinse with warm salt water. Cleveland Clinic suggests warm water with a pinch of salt to soothe sore gums and ease swelling. It's an old, cheap remedy. Research on it is limited, but it's gentle and helps flush out debris.
- Use a cold pack on the outside of your face. A few times a day for short periods, per Cleveland Clinic. Wrap ice in a cloth rather than putting it on the gum.
- Take an over-the-counter pain reliever if you need one. Ibuprofen or acetaminophen (paracetamol) can ease pain while you arrange a dental visit (HSE). Follow the label and ask a pharmacist if you take other medicines. Don't put aspirin or other tablets directly on the gum.
- Skip irritants for a while. Tobacco, alcohol, harsh alcohol-based rinses, very hot or spicy foods, and sharp foods like chips and popcorn can make sore gums worse (MedlinePlus).
- Give it two weeks. If plaque was the cause, swelling should be clearly better within a week or two. If it isn't, that's your cue to book a visit.
What about oil pulling, mouthwash and gels?
Antiseptic mouthwashes can reduce plaque, but none replaces brushing and cleaning between teeth, and harsh alcohol-heavy rinses can sting inflamed tissue. Oil pulling is popular but the evidence is modest; we went through it honestly in our oil pulling guide. Hyaluronic acid gels have the most interesting research of the topical options. A 2025 systematic review and meta-analysis of 18 studies found that hyaluronic acid used alongside professional periodontal treatment improved gum measures such as bleeding and pocket depth in the short to medium term, but the studies varied widely, showed signs of publication bias and included only one gingivitis-specific trial (López-Valverde et al., 2025, Bioengineering). Promising, not proven. More in hyaluronic acid for gums.
Daily care that keeps swelling from coming back
Once the swelling settles, the goal is to stop plaque from building up in the same places again.
- Brush twice a day for two minutes, focusing on the gumline. In my own routine I spend extra time working toothpaste along the gumline, which is where gum problems start.
- Clean between your teeth daily. A Cochrane review found that adding floss to toothbrushing reduced gingivitis compared with brushing alone, and interdental brushes may work even better where they fit, though the evidence was low certainty and short-term (Worthington et al., 2019). Use the tool you'll actually use every day.
- Get professional cleanings. Only a hygienist can remove tartar. NIDCR recommends regular check-ups and cleanings.
- Don't smoke. Tobacco is the most significant risk factor for gum disease and slows healing (NIDCR).
- Eat for your gums. Plenty of vegetables, fruit and whole foods, and fewer sugary snacks and drinks. Gum disease runs on my mother's side of the family, and my gums used to be inflamed and sensitive. The first real change I noticed came after eating pastured beef kidney, when my gums went from inflamed to calm and firm within days. It didn't last on its own and it's one person's experience, not a study, but it's why diet is part of my routine. See foods good for teeth and gums for what I eat.
- Choose a gentle toothpaste. If your gums react easily, look for one without sodium lauryl sulfate (SLS), which can irritate sensitive mouth tissue in some people (see our SLS-free toothpaste guide), and without harsh abrasives.
We built TranscenDental toothpaste for people who care about their gums: no SLS, no glycerin and no silica, with hyaluronic acid as our humectant, organic birch xylitol as the second ingredient, 10% nano-hydroxyapatite, and herbs used in traditional gum care such as clove, rosemary, sage, miswak and gotu kola. It's a cosmetic toothpaste, not a treatment for swollen gums or gum disease. Customers mostly comment on how it feels: Carla D. wrote, "So natural its insane. Good clean feeling in mouth," and Amelie B. described the taste as "mild and medicinal." For between your teeth, our bamboo floss is a natural-fiber floss with no PTFE coating.
When to see a dentist or doctor
Book a dental visit if:
- Swelling lasts longer than two weeks or keeps getting worse (Cleveland Clinic; MedlinePlus)
- A bump, pimple or pus appears on the gum
- The gum is very painful, or a tooth feels loose or tender to bite on
- Swelling keeps coming back around a wisdom tooth
- Your gums are pulling away from your teeth (see how to stop gum recession)
- You're pregnant and your gums are very swollen or sore
Get urgent help (same day, or the emergency department) if gum swelling comes with:
- Swelling spreading into your face, around your eye or down your neck
- Difficulty breathing or swallowing (HSE)
- Fever and feeling generally unwell
- Being unable to open your mouth properly
See a doctor if swollen gums come with easy bruising, nosebleeds, unusual tiredness, unexplained weight loss, or if you've started a new medication. Swelling that persists despite good cleaning can point to a medical cause a dentist will want to rule out.
Build the full routine: brush with TranscenDental toothpaste, clean between your teeth with plastic-free bamboo floss, and finish after meals with an Ora Flora xylitol mint. All three come together in the Oral Care Trio, which saves $12.
Frequently asked questions
How long do swollen gums take to go down?
Swelling from gingivitis usually improves within one to two weeks of gentle brushing and daily flossing. Swelling from trapped food often settles in a day or two once the area is clean. If it lasts longer than two weeks, see a dentist. Our post on how long gingivitis lasts covers the timeline.
Can swollen gums go away on their own?
Not if plaque is the cause and nothing changes. Gingivitis tends to stick around until plaque is removed regularly. An abscess never goes away on its own and needs a dentist.
What is the fastest way to get swollen gums down?
Clear out anything stuck, rinse with warm salt water, use a cold pack on the outside of your cheek and keep brushing gently. An over-the-counter pain reliever can help with soreness. Lasting improvement comes from removing plaque daily.
Does salt water help swollen gums?
A warm saltwater rinse is a standard home step that Cleveland Clinic recommends for soothing sore gums. Research on it is limited, so treat it as comfort and cleanup, not a cure.
Why is my gum swollen around one tooth but doesn't hurt?
It could be trapped food, local gingivitis, or an infection that is draining and no longer painful. If it doesn't settle within a few days of careful cleaning, have a dentist check it.
Can flossing cause swollen gums?
Snapping floss into the gum can irritate it, and gums may be tender for a few days when you start flossing. Ongoing swelling is more often from plaque left between the teeth, which daily, gentle flossing helps remove.
When are swollen gums an emergency?
When swelling spreads to your face, eye or neck, or comes with fever, difficulty swallowing or difficulty breathing. Seek urgent care right away.
Are swollen gums a sign of pregnancy?
Gum changes are common in pregnancy, with about 60% to 75% of pregnant women having gingivitis according to the ADA, but swollen gums on their own aren't a reliable pregnancy sign. Keep up gentle cleaning and tell your dentist you're pregnant.
What I brush with every day
10% nano-hydroxyapatite, organic birch xylitol and 2% theobromine in a probiotic herbal ferment. No fluoride, SLS or glycerin.
