Most tongue sores are canker sores (aphthous ulcers) or minor injuries from biting your tongue, and they heal on their own within one to two weeks. The goal of treatment is to reduce pain, avoid irritating the sore further, and speed up healing. Small ulcers, the most common type, are typically under 5 mm across and resolve in 4 to 14 days without any medical intervention. Larger or more persistent sores sometimes need stronger treatment.
Figure Out What You’re Dealing With
Before you treat a tongue sore, it helps to know what caused it. The most common culprits are canker sores and traumatic injuries, and they call for slightly different approaches.
Canker sores appear as small, round or oval ulcers with a whitish or yellowish center and a red border. They show up on the tongue, inner cheeks, or lips, and they tend to recur. Stress, hormonal changes, certain foods, and nutritional gaps can all trigger them.
Traumatic ulcers come from biting your tongue during chewing, talking, or sleeping, or from scraping it on a sharp tooth or piece of food. They’re most common on the tongue, lips, and inner cheeks. About 25% of all traumatic mouth injuries occur on the tongue. These sores usually heal within 10 days, but tongue ulcers can linger longer because the tongue moves constantly and reinjures the tissue.
Cold sores caused by the herpes virus look different: they start as small clustered blisters, usually on keratinized tissue like the hard palate or gums rather than the tongue itself. If you do get herpes-related sores inside your mouth, they tend to appear on one side and resolve in 10 to 14 days.
Salt Water Rinses and Other Home Treatments
A salt water rinse is the simplest and most effective starting point. Mix about one teaspoon (5 grams) of table salt into a cup (250 ml) of warm water. Swish it around your mouth for about two minutes, then spit it out. Do this three times a day. Research on wound-healing cells shows this concentration promotes tissue repair without damaging the surrounding tissue.
Dabbing a small amount of milk of magnesia directly onto the sore a few times a day can also soothe it. The alkaline coating neutralizes acid in the mouth and forms a mild protective barrier over the ulcer. You can also try holding a small ice chip against the sore to temporarily numb the pain.
Over-the-Counter Pain Relief
If home rinses aren’t enough, pharmacy products with numbing or antiseptic ingredients can help. Gels and pastes containing benzocaine (sold as Anbesol, Orabase, or Zilactin-B) numb the sore on contact and are most effective when applied as soon as the ulcer appears. Look for products specifically labeled for mouth sores rather than general pain relief.
Antiseptic rinses containing hydrogen peroxide, like Orajel Antiseptic Mouth Sore Rinse, help keep the area clean and may speed healing. These are gentler than rinsing with straight hydrogen peroxide from the bottle, which can irritate tissue at full strength.
For sores that are especially painful during meals, an over-the-counter oral pain rinse used 10 to 15 minutes before eating can make a real difference.
What to Eat and What to Avoid
What you eat matters as much as what you put on the sore. Several categories of food will actively slow healing or make pain worse:
- Spicy foods: Hot peppers, sriracha, curry, salsa, chili powder, and crushed red pepper flakes all contain capsaicin, which directly irritates open sores.
- Acidic foods and drinks: Citrus fruits, tomatoes, berries, pineapple, vinegar, coffee, alcohol, and fruit juice sting on contact and can delay healing.
- Hard or crunchy foods: Granola, pretzels, crusty bread, popcorn, potato chips, and crackers can scrape the sore and reopen it.
Stick to soft, cool, or room-temperature foods while your tongue heals. Yogurt, smoothies (skip the citrus), mashed potatoes, scrambled eggs, and oatmeal are all easy on a sore tongue. Drinking through a straw can help liquids bypass the sore.
When Stronger Treatment Is Needed
Larger canker sores, those over 1 cm across, are classified as major-type ulcers. These can last anywhere from 10 days to 6 weeks and sometimes need prescription-strength treatment. A doctor or dentist can prescribe a steroid mouth rinse that you swish and spit out four times a day, typically after meals and before bed. The key with these rinses is contact time: you hold the liquid in your mouth for about a minute, spit it out, and then avoid eating or drinking for at least 30 minutes so the medication stays in contact with the tissue.
For sores in a spot that’s easy to reach, prescription steroid ointments or dental pastes can be applied directly. You dab a thin film onto the dried surface of the sore without rubbing it in. These work best when the sore stays undisturbed afterward, so applying them at bedtime is practical.
People who get a rare pattern called herpetiform aphthous ulcers, clusters of very small (1 to 2 mm) sores that appear in groups, generally see them resolve within 7 to 10 days. Despite the name, these aren’t caused by the herpes virus and are treated the same way as other canker sores.
Nutritional Gaps That Cause Recurring Sores
If tongue sores keep coming back, your diet may be part of the problem. People with recurrent canker sores consume significantly less vitamin B12 and folate than people who don’t get them. In one study, people with recurring sores had daily B12 intake about 7% below recommended levels and folate intake about 20% below recommended levels compared to the general population.
Good sources of B12 include meat, fish, eggs, and dairy. Folate is found in leafy greens, legumes, and fortified grains. If you eat a restricted diet or suspect a deficiency, increasing your intake of these nutrients, through food or a supplement, may reduce how often sores appear.
Iron and zinc deficiencies have also been linked to recurring mouth ulcers, so a basic blood panel can help identify any gaps worth addressing.
Signs a Tongue Sore Needs Professional Evaluation
Most tongue sores are harmless and temporary, but a sore that doesn’t heal within two to three weeks needs attention. The Oral Cancer Foundation recommends that any oral lesion lasting longer than two to four weeks be evaluated by a specialist without delay. A sore that doesn’t respond to normal treatment should be considered potentially serious until proven otherwise through a tissue biopsy.
Early warning signs of oral cancer include a nonhealing ulcer, a persistent red or white patch, progressive swelling, unusual surface changes on the tongue, or unexplained bleeding. Later signs can include numbness or tingling in the tongue or lips, difficulty swallowing, or persistent pain that radiates to the ear. These symptoms don’t automatically mean cancer, but they do mean the sore has moved beyond the range of home treatment and needs a definitive diagnosis.