Most tongue sores are canker sores (aphthous ulcers), and minor ones heal on their own within 10 to 14 days. The goal of treatment is to reduce pain, avoid irritating the sore further, and create conditions that let it heal faster. Larger or more stubborn sores sometimes need prescription treatment, but the majority respond well to simple home care.
Figure Out What You’re Dealing With
The most common tongue sore is a canker sore: a small, round ulcer with a white or yellowish center and a red border. Minor canker sores are less than 1 cm across and heal without scarring in one to two weeks. Major canker sores are larger than 1 cm, can last up to six weeks, and often leave scars. A less common type, called herpetiform, appears as clusters of tiny ulcers (up to 100 at once) that heal within about two weeks.
Cold sores are different. Caused by the herpes simplex virus, they typically appear as blisters that crust over, often preceded by itching, burning, or tingling. About 60% of people feel that warning sensation before a blister shows up. Stress, fatigue, illness, sunlight, and menstruation can all trigger a recurrence. Cold sores require antiviral treatment rather than the approaches described below.
White patches that can’t be wiped away and don’t hurt are a separate condition called leukoplakia, most often linked to tobacco and alcohol use. Smokers have a sixfold higher incidence. These patches need professional evaluation, not home remedies.
Home Remedies That Help
A saltwater rinse is the simplest and most widely recommended first step. Dissolve half a teaspoon of salt in a cup of warm water, swish gently for 20 to 30 seconds, and spit it out. Salt draws fluid from the inflamed tissue, which temporarily reduces swelling and creates an environment less friendly to bacteria. You can repeat this several times a day, especially after meals.
Placing a small ice chip directly on the sore numbs the area and can ease pain quickly. Some people also find relief from dabbing a small amount of milk of magnesia on the ulcer a few times a day, which coats the surface and neutralizes acid.
Over-the-Counter Pain Relief
Topical gels and liquids containing benzocaine are the most common OTC option for numbing tongue sores. They come as gels, sprays, liquids, and lozenges and work by temporarily blocking nerve signals at the surface. Apply a small amount directly to the sore as needed. One important safety note: benzocaine products should not be used on children under 2 years old, as the FDA has warned they can cause a rare but serious blood condition in very young children.
Protective pastes that form a barrier over the ulcer are another option. These stick to the moist surface of the mouth and shield the sore from contact with food and teeth, which both reduces pain and gives the tissue a better chance to heal undisturbed.
When You Need Prescription Treatment
For canker sores that are large, unusually painful, or keep coming back, a doctor or dentist can prescribe stronger options. A steroid mouth rinse containing dexamethasone reduces inflammation and pain across the entire mouth, which is helpful when multiple sores are present. For individual ulcers, prescription-strength steroid pastes or creams can be applied directly to speed healing.
Oral steroid medications are reserved for severe cases that don’t respond to anything else, because they carry more significant side effects. In some cases, doctors use medications originally designed for other conditions, like a coating agent typically used for intestinal ulcers, to protect the oral tissue while it heals. A 2025 review of treatment approaches found that non-drug therapies, including laser treatment, offered the best balance of benefit and risk for people with recurring canker sores.
Foods and Drinks to Avoid
What you eat can make the difference between a sore that heals quickly and one that stays angry for days. The biggest offenders are acidic and abrasive foods. Specifically, avoid:
- Citrus fruits and juices: oranges, lemons, limes, grapefruit, pineapple
- Tomato-based foods: marinara sauce, ketchup, salsa, tomato juice
- Spicy dishes: curry, chili, hot sauce, salsa
- Rough or crunchy textures: crusty bread, dry crackers, bagels, chips
- Carbonated, caffeinated, or alcoholic drinks
Very hot food and beverages also irritate open sores. Stick to soft, cool, or lukewarm foods while your tongue heals. Smoothies, yogurt, mashed potatoes, scrambled eggs, and oatmeal are all gentle choices. When you do your oral care routine, skip alcohol-based mouthwashes, as these sting and can slow healing.
Nutritional Deficiencies Worth Checking
If tongue sores keep coming back, the cause may be nutritional. Deficiencies in vitamin B12, folate, and iron are all linked to recurrent mouth ulcers and a sore, reddened tongue. This is especially worth considering if you also feel unusually tired, lightheaded, or short of breath, which are signs of the anemia these deficiencies can cause. A simple blood test can identify the problem, and correcting the deficiency often reduces or eliminates recurring sores.
Preventing Future Sores
Switching to a toothpaste free of sodium lauryl sulfate (SLS), a common foaming agent, is one of the most frequently recommended prevention strategies. The evidence is mixed: some studies found a 70% reduction in ulcers among people who made the switch, while others found no change in frequency. However, a well-designed trial of 90 people with recurrent ulcers found that even though the SLS-free toothpaste didn’t reduce how often sores appeared, participants reported less pain and slightly faster healing while using it. Given that the downside is essentially zero, it’s a reasonable experiment if you get canker sores regularly.
Other practical prevention steps include being careful not to bite your tongue or cheek while eating, using a soft-bristled toothbrush, managing stress (a known trigger for both canker sores and cold sore outbreaks), and making sure your diet includes adequate B12, folate, and iron.
Signs a Tongue Sore Needs Professional Attention
Most tongue sores resolve within two weeks. If yours persists beyond that point, it should be evaluated by a doctor or dentist. A standard approach is to remove any obvious irritants (a sharp tooth edge, for example) and then reassess after 14 days. Sores that remain after two weeks are candidates for biopsy to rule out something more serious.
Certain features raise more concern: a sore that is red or a mix of red and white, feels hard or fixed to deeper tissue, bleeds easily, or grows rapidly. Any new or changing pigmented spot on the tongue also warrants prompt evaluation. These characteristics don’t necessarily mean cancer, but they do mean the sore shouldn’t be managed at home any longer.