Most canker sores on the tongue heal on their own within 10 to 14 days, but the right care can cut down pain and speed that timeline. These small, shallow ulcers aren’t contagious and aren’t cold sores. They form on the soft tissue of your mouth, and the tongue is one of the most painful spots to get one because it moves constantly against your teeth and food.
The goal is twofold: reduce pain so you can eat and talk normally, and create conditions that let the sore heal as fast as possible.
Salt Water Rinses and Other Home Options
A warm salt water rinse is the simplest and most widely recommended first step. It neutralizes the oral environment around the ulcer and supports healing. Mix about half a teaspoon of table salt into a cup of warm water and swish gently for 30 seconds, then spit. Do this several times a day, especially after meals. A 7 percent salt concentration has been shown to improve wound healing effectiveness, though you don’t need to measure precisely for a basic rinse.
One important note: don’t rub salt directly onto the sore. This is a common folk remedy, but it traumatizes the ulcer further and causes significant pain without any added benefit over a rinse.
Baking soda works similarly. Dissolve a teaspoon in half a cup of warm water and use it as a rinse, or mix a small amount with water to form a paste and dab it on the sore. This helps neutralize acids in your mouth that irritate the open tissue. Honey applied directly to the ulcer several times a day can also soothe pain and may promote healing thanks to its natural antimicrobial properties. With a tongue sore specifically, honey has the advantage of sticking to the surface briefly even as you swallow.
Over-the-Counter Products That Help
If home rinses aren’t enough, OTC products designed for mouth sores can numb the pain and form a protective barrier over the ulcer. Look for gels, pastes, or liquids containing benzocaine, which is a topical numbing agent found in products like Anbesol, Orabase, and Zilactin-B. Apply these directly to the sore, and they’ll provide temporary relief so you can eat or drink without wincing.
Antiseptic mouth rinses containing hydrogen peroxide (like Orajel Antiseptic Mouth Sore Rinse) help keep the area clean and reduce bacteria that can slow healing. These are especially useful for tongue sores, where a paste or gel may not stay in place as long as it would on the inside of a cheek or lip. For the best results, apply any topical product as soon as the sore appears. Early treatment consistently leads to faster resolution.
Foods to Avoid While It Heals
What you eat matters more than you might expect. Acidic foods like citrus fruits, tomatoes, and vinegar-based dressings create a chemical sting on the open tissue and can extend healing time. Spicy foods, salty snacks, and anything with rough or sharp edges (chips, crusty bread, raw nuts) physically scrape the ulcer every time you chew. Coffee and other caffeinated drinks are also common irritants.
Less obvious triggers include cheese, eggs, peanuts, and almonds. These foods have been identified as potential canker sore triggers for some people, so if you notice a pattern with certain foods, it’s worth cutting them out during an active sore and seeing if your recurrence rate drops over time. Stick to soft, bland, cool foods while the sore is at its worst. Yogurt, smoothies, oatmeal, and mashed potatoes are all easy choices.
Why Some People Get Them Repeatedly
If canker sores keep coming back, the cause is often something systemic rather than just bad luck. Deficiencies in vitamin B12, folate, and iron are strongly linked to recurrent mouth ulcers. Low B12 is diagnosed when blood levels fall below 200 pg/ml, and folate deficiency shows up when serum folate drops below 3 ng/ml. Both can be corrected with supplements or dietary changes, and many people see their sores stop or become less frequent once levels normalize.
Your toothpaste could also be a factor. Sodium lauryl sulfate (SLS) is a foaming detergent in nearly all standard toothpastes, and it strips away the protective mucous lining in your mouth. This leaves the tissue more vulnerable to irritants that trigger canker sores. Some people experience noticeably fewer outbreaks after switching to an SLS-free toothpaste. Brands like Sensodyne, Biotene, and several others make SLS-free versions that are easy to find at most drugstores.
Stress, hormonal changes, and minor mouth injuries (biting your tongue, irritation from braces or dental work) are other well-established triggers. You can’t always avoid these, but knowing what sets off your sores helps you act quickly when one starts forming.
Minor Sores vs. Major Sores
Most canker sores are classified as minor. They’re under a centimeter across and heal within 10 to 14 days without scarring. These are the ones that respond well to the home care and OTC treatments described above.
Major canker sores are between 1 and 3 centimeters in diameter. They’re deeper, significantly more painful, and can take up to six weeks to heal. They sometimes leave scars. If you have a sore this large on your tongue, prescription treatment can help. Options include prescription-strength topical gels and steroid-based mouth rinses that reduce inflammation more aggressively than anything available over the counter.
Signs a Sore Needs Professional Attention
A canker sore that hasn’t healed after two weeks should be evaluated by a dentist or doctor. Other warning signs include bleeding from the sore that won’t stop, a visible lump or bump under the skin where the ulcer sits, or any change in the sore’s appearance (color shifts to red, white, or mottled patches) without progress toward healing. Texture changes like rough patches, cracking, or a crusty surface are also worth getting checked. Swelling or lumps in your neck, cheek, or jaw alongside a persistent mouth sore can signal something more serious than a canker sore, including oral cancer, which is highly treatable when caught early.
The key distinction is straightforward: canker sores hurt but improve steadily and disappear. Anything that lingers, grows, or changes without healing follows a different pattern and deserves a closer look.