Most tongue sores are canker sores, and the good news is they heal on their own within a few weeks. The bad news is that those weeks can be miserable, especially when you’re eating, drinking, or talking. There are several things you can do to speed up healing, reduce pain, and prevent sores from coming back.
What You’re Probably Dealing With
The most common type of tongue sore is a canker sore (aphthous ulcer), which appears as a single round white or yellow sore with a red border. These form only inside the mouth, on the tongue, inner cheeks, or inner lips. They’re not contagious and not caused by a virus.
Cold sores are different. They show up as clusters of small fluid-filled blisters, almost always on the outside of the mouth around the lip border. If your sore is on the tongue itself and looks like a shallow crater rather than a blister, it’s almost certainly a canker sore.
Minor canker sores, the kind most people get, are smaller than a pea and heal within a few weeks without scarring. Major canker sores are larger than one centimeter, extremely painful, and can take months to heal, sometimes leaving scars behind.
Saltwater Rinses Are Your Best First Step
A warm saltwater rinse is the simplest and most effective home treatment. Mix one teaspoon of salt into eight ounces of warm water and swish gently for 30 seconds, two to three times a day. If that stings too much, cut the salt to half a teaspoon for the first day or two.
Saltwater works in a few ways. It kills bacteria by pulling water out of their cells through osmosis. It also shifts the pH inside your mouth toward alkaline, creating an environment where bacteria struggle to survive. Beyond just cleaning the area, salt water actively promotes wound repair by encouraging the cells responsible for tissue regeneration to migrate to the injury site faster.
What to Eat and Avoid While Healing
Spicy and acidic foods won’t cause tongue sores, but they will irritate an existing one and make healing more uncomfortable. Citrus fruits, tomato-based sauces, vinegar-heavy dressings, and anything with chili or hot spice can all aggravate the raw tissue. Crunchy foods like chips and toast can physically scrape the sore and restart inflammation.
Stick to soft, cool foods while your tongue heals. Yogurt, smoothies, mashed potatoes, scrambled eggs, and oatmeal are all easy options. Drinking cool beverages through a straw can help bypass the sore entirely. This isn’t a permanent change to your diet, just a strategy for the one to two weeks your sore needs to close up.
Over-the-Counter Pain Relief
Topical oral gels containing a numbing agent (look for benzocaine on the label) can temporarily dull the pain when applied directly to the sore. These are available at any pharmacy and work within minutes, though the relief typically lasts only 30 to 60 minutes. Applying the gel before meals makes eating significantly more tolerable.
Protective oral pastes create a thin barrier over the sore, shielding it from contact with food and your teeth. These tend to last longer than numbing gels and can be especially helpful at night if you find yourself biting or rubbing the sore in your sleep. Over-the-counter anti-inflammatory pain relievers taken by mouth can also reduce the swelling and dull the ache throughout the day.
Why You Keep Getting Tongue Sores
If tongue sores are a recurring problem, the cause is worth investigating. Several nutritional deficiencies are linked to recurrent mouth ulcers. Low levels of vitamin B12, folate, and iron can all cause a sore, red tongue that’s prone to ulcers. If you’re also experiencing fatigue, pale skin, or tingling in your hands and feet alongside frequent sores, a simple blood test can check for these deficiencies.
Physical irritation is another common trigger. A sharp tooth edge, poorly fitting dental work, or a habit of biting your tongue can repeatedly damage the same spot and prevent full healing. Stress and lack of sleep are also well-established triggers, though the exact mechanism isn’t fully understood.
Switch Your Toothpaste
This is one of the most overlooked prevention strategies. Most toothpastes contain sodium lauryl sulfate (SLS), a foaming agent that can irritate the delicate tissue inside your mouth. A meta-analysis of clinical trials found that people who switched to SLS-free toothpaste had roughly one fewer ulcer at a time compared to those using standard toothpaste. Their ulcers also healed about two days faster, occurred less frequently, and were less painful.
SLS-free toothpastes are widely available and work just as well for cleaning your teeth. If you get canker sores more than a few times a year, this single change is worth trying before anything else. Most people notice a difference within a month or two of switching.
When a Tongue Sore Needs Attention
A sore that hasn’t healed after three weeks deserves a closer look from a dentist or doctor. The same goes for sores that are unusually large, spreading, accompanied by a high fever, or making it difficult to swallow liquids. Painless lumps or patches on the tongue that don’t go away, particularly white or red patches that can’t be scraped off, should also be evaluated, as these can occasionally signal something more serious than a canker sore.
Frequent recurrences (more than three or four times a year) paired with other symptoms like joint pain, digestive issues, or skin rashes can sometimes point to an underlying condition like celiac disease or an autoimmune disorder, where mouth ulcers are one of the earliest signs.