Gum Pain: Common Causes and What Helps
By Aurora Gateway Dental Care · Published October 29, 2026 · Updated October 29, 2026 · Reviewed by our dentists
The short answer
When a gum hurts, the cause is often something simple: food stuck under the gum, brushing too hard, a mouth sore or a burn. Ongoing soreness, swelling or bleeding can point to gum disease, an infection or a wisdom tooth coming in. Gentle cleaning and salt water rinses help; pain lasting over a week needs a dentist.
Why does my gum hurt?
Gums are soft tissue with a good blood supply and many nerve endings, so they react quickly to irritation. When a gum hurts, the cause can be something stuck there, something that scraped it, or a problem with the tooth or bone underneath.
One clue is where the pain is. Soreness in one small spot often has a local cause, such as a popcorn hull wedged at the gumline. Tender, puffy gums around many teeth point more toward inflammation from plaque. Pain at the very back of the mouth in a teen or young adult often involves a wisdom tooth.
Common causes of sore gums
- Trapped food, especially seeds, husks, small bones or the hull of a popcorn kernel
- Gingivitis, the early stage of gum disease, which makes gums red, puffy and tender
- Canker sores, small round ulcers with a white or yellow centre and red border
- Burns from hot pizza, soup or drinks, usually on the roof of the mouth or behind the front teeth
- A partly erupted wisdom tooth with an inflamed gum flap over it
- A gum or tooth abscess, which may cause throbbing pain and swelling
- Rubbing from braces, a retainer, a denture or a sharp edge on a broken tooth
- Hormone changes during puberty, pregnancy or around periods, which can make gums more sensitive
- Tobacco, vaping and some strong mouthwashes, which can irritate tissue
Gums hurt when brushing
If your gums hurt when brushing, look first at how you brush. A hard-bristled brush, scrubbing back and forth, or pressing too firmly can bruise gums and, over time, wear them back. Switch to a soft brush and use small, gentle circles with the bristles angled toward the gumline. An electric brush with a pressure sensor may help if you tend to push hard.
Gums that sting and bleed when you brush usually have plaque sitting along them. It feels odd, but the answer is to keep cleaning gently, not to avoid the area. If soreness and bleeding don't improve after about two weeks of careful brushing and daily flossing, see a dentist. Our article on gingivitis and bleeding gums explains this stage in detail.
Starting to floss after a break can also cause tenderness for a few days. That usually settles as the gums get healthier.
Gum pain relief you can try at home
These steps can ease mild soreness while you work out the cause. They don't replace an exam if the pain keeps coming back.
- Rinse with warm salt water, about half a teaspoon of salt in a cup of warm water, two or three times a day. Adults and older children who can spit it out can do this.
- Floss gently around the sore area in case something is stuck under the gum.
- Avoid spicy, acidic, crunchy and very hot foods for a few days.
- For a canker sore, a pharmacy gel made for mouth ulcers may help. Ask a pharmacist which one suits you.
- An over-the-counter pain reliever can help for a short time. Take it only as directed on the package, and ask a pharmacist if you take other medicines or have health conditions.
- Never hold a pain tablet against the gum. It can burn the tissue and make things worse.
Gum pain in pregnancy, children and people with braces
During pregnancy, hormones can make gums swell and bleed more easily. Keep brushing and flossing, and keep your dental visits. Dental checkups and cleanings are considered safe in pregnancy, so tell your dentist you're pregnant.
In children, sore gums may come from teething, new adult molars coming in, or a mouth sore after a cold. With braces, small ulcers from brackets are common in the first weeks. Orthodontic wax over the rough spot can give the gum a chance to heal.
Signs your gum pain needs a dentist
Book a dental visit if any of these apply. A dentist can find the source, clean under the gum if needed and treat the cause.
- Pain or swelling that lasts more than a week, or keeps coming back in the same spot
- A pimple-like bump on the gum, pus or a bad taste
- Gums that bleed often or look like they are pulling away from teeth
- A loose adult tooth
- A sore, white or red patch, or a lump, that hasn't healed in two weeks
When gum pain is an emergency
Gum pain with swelling of the face or jaw, a fever, or trouble opening your mouth needs to be seen soon. Call a dentist the same day you notice it. Go to the emergency department or call 911 if swelling spreads toward the eye or neck, or makes it hard to breathe, swallow or speak.
If you're in Aurora or nearby, you can call Aurora Gateway Dental Care at 289-475-5497. If we're closed, follow the instructions on our line. Gum care is part of our regular checkups, and our team can explain what is causing the pain and what will help.
Questions
How long should gum pain last before I see a dentist?
Minor soreness from a scrape, burn or new flossing habit usually eases within a few days. If it lasts more than a week, keeps returning or comes with swelling, book a dental visit.
Can stress cause sore gums?
Stress can play a part. It is linked to canker sores and to clenching or grinding, which can make the gums and jaw feel sore. It may also make it harder to keep up with daily brushing and flossing.
Is salt water good for sore gums?
A warm salt water rinse is a simple, gentle way to clean the area and soothe tissue. It doesn't cure an infection or gum disease, so it should only be a short-term help while you find the cause.
Why does only one spot on my gum hurt?
A single sore spot often comes from trapped food, a small ulcer or a local infection. Floss gently to clear the area. If there is a bump, swelling or throbbing, have a dentist check for an abscess.
General information, not personal medical advice. If you have pain, swelling or an injury, call us at 289-475-5497.