Most tongue sores heal on their own within one to two weeks without any treatment. But you can speed things up and cut down on pain by keeping the area clean, avoiding irritants, and using a few simple remedies at home. The approach depends partly on what’s causing the sore, so identifying the type matters.
What’s Causing Your Tongue Sore
The most common tongue sore is a canker sore (aphthous ulcer), a small, round, whitish or yellowish ulcer with a red border. These aren’t contagious and tend to show up after stress, hormonal shifts, or minor injury. You might also have a traumatic ulcer from biting your tongue, burning it on hot food, or irritation from a rough tooth edge or braces. These look similar but are easier to trace back to a specific event.
Less commonly, a red, flat, or worn-looking patch on the tongue (called erythroplakia) can develop. White patches also occur. Both of these deserve professional attention, especially if they’re painless, hard, or don’t go away, since persistent painless sores or lumps on the tongue can be an early sign of oral cancer.
How Long Healing Takes
Minor canker sores, which are smaller than a pea, typically heal within a few weeks and don’t leave scars. Major canker sores, larger than about one centimeter, are a different story. They’re extremely painful and can take months to fully heal, often leaving scars behind. A rarer type called herpetiform canker sores appears as clusters of tiny pinpoint ulcers and generally resolves within about two weeks.
Traumatic ulcers follow a similar timeline to minor canker sores once the source of irritation is removed. If you keep re-biting the same spot or a sharp tooth keeps rubbing, the sore won’t close.
Salt Water and Baking Soda Rinse
A saline rinse is the simplest and most effective home treatment. It reduces bacteria around the sore, lowers inflammation, and creates a mildly alkaline environment that supports healing. The ratio recommended by St. Jude Children’s Research Hospital is 1 teaspoon of table salt and 1 teaspoon of baking soda dissolved in 4 cups of warm water. Swish gently for 30 seconds and spit. You can do this several times a day, especially after meals.
Avoid alcohol-based mouthwashes. They sting, dry out oral tissue, and can actually delay healing.
Over-the-Counter Pain Relief
If the sore is making it hard to eat or talk, a topical oral gel with benzocaine (typically 20%) numbs the area on contact. Products marketed for mouth sores often combine benzocaine with menthol and zinc chloride, which acts as an astringent to help protect the sore’s surface. Apply a small amount directly to the ulcer as needed. The numbing effect is temporary, usually lasting 15 to 30 minutes, but it can make meals much more manageable.
For deeper pain, an over-the-counter anti-inflammatory like ibuprofen can help reduce both pain and swelling from the inside.
Honey as a Topical Treatment
Applying honey directly to a tongue sore is more than a folk remedy. In a randomized controlled trial of children with chemotherapy-related mouth sores, those treated with Manuka honey had significantly less severe ulceration and less pain compared to a control group receiving standard care. Honey’s natural antibacterial properties and its ability to form a protective coating over the wound likely explain the benefit. Dab a small amount of raw or Manuka honey onto the sore a few times a day, letting it sit as long as you can before swallowing.
Foods That Slow Healing
What you eat matters as much as what you apply. Certain foods directly irritate open tissue on the tongue and can turn a mild sore into a throbbing one. Avoid these until the sore closes:
- Citrus and acidic fruits: oranges, lemons, limes, pineapple, tomatoes, and tomato-based sauces
- Spicy foods: curry, chili, hot sauce, salsa
- Salty or crunchy foods: chips, pretzels, salted crackers, crusty bread, bagels
- Tough or dry textures: dry poultry, raw vegetables with hard skins
- Irritating drinks: carbonated beverages, alcohol, very hot coffee or tea
- Pickled foods: the vinegar acts like acid directly on the wound
Stick with soft, cool, or room-temperature foods. Yogurt, mashed potatoes, smoothies, scrambled eggs, and oatmeal are all easy on a sore tongue. Drinking through a straw can help liquids bypass the sore entirely.
Nutritional Deficiencies That Cause Recurring Sores
If tongue sores keep coming back, the problem may not be local. It may be nutritional. Deficiencies in vitamin B12, vitamin C, and folate are all linked to recurrent aphthous ulcers, and each one affects the mouth differently.
Vitamin B12 deficiency causes inflammation of the tongue (glossitis), increased sensitivity, and painful ulcerative lesions. It’s especially common in people over 50, vegetarians, and anyone with absorption issues. Vitamin C deficiency slows wound healing and is associated with small, painful ulcers and bleeding gums. Folate deficiency disrupts the renewal of the cells lining your mouth, making the tissue fragile and prone to erosions and a burning sensation.
If you notice a pattern of sores appearing every few weeks, it’s worth having your levels checked. B12 supplementation at 500 to 1,000 micrograms daily can correct a mild deficiency. Vitamin C at 100 to 500 milligrams daily handles mild cases. Folate is typically addressed through diet (leafy greens, legumes, fortified grains) or a supplement. Correcting the underlying deficiency often stops the cycle of recurring sores entirely.
When a Tongue Sore Needs Professional Attention
Most tongue sores are harmless nuisances. But certain features signal something more serious. Get evaluated if you have a sore that lasts longer than two weeks, a painless lump or thickening on the tongue, a red or white patch that doesn’t go away, bleeding from the sore without obvious cause, or difficulty swallowing or moving your tongue. Tongue cancer often first appears as a sore that simply won’t heal. Pain isn’t a reliable indicator either way, since early cancerous lesions are frequently painless.
Hard, fixed lumps are more concerning than soft, movable ones. And any sore that changes in size, shape, or color over several weeks rather than shrinking deserves a closer look from a dentist or doctor.