Most canker sores on the tongue heal on their own within one to two weeks, but the pain can make eating, drinking, and even talking miserable in the meantime. The good news: a combination of over-the-counter treatments, simple rinses, and smart food choices can cut both the pain and healing time. Here’s what actually works.
Start Treatment Early for Best Results
Topical products work best when you apply them as soon as you notice the sore forming. Over-the-counter pastes, gels, and liquids with numbing agents like benzocaine (sold as Anbesol, Orabase, and Zilactin-B) create a temporary barrier over the ulcer and dull the pain on contact. Antiseptic rinses containing hydrogen peroxide (such as Orajel Antiseptic Mouth Sore Rinse) help keep the area clean and may speed healing slightly.
The tongue is tricky because it’s constantly moving and wet, which makes keeping any product in place a challenge. The most effective technique: blot the sore dry with a clean tissue first, then dab a small amount of gel or paste onto the spot using a cotton swab. After applying, avoid eating or drinking for at least 30 minutes so the medication stays put rather than washing away immediately.
Saltwater and Baking Soda Rinses
A simple saltwater rinse is one of the oldest and most reliable home remedies. Mix about half a teaspoon of salt into a cup of warm water, swish it around your mouth for 30 seconds, and spit it out. Repeat a few times a day, especially after meals. The salt draws fluid from the inflamed tissue, which helps reduce swelling and keeps bacteria from settling into the wound.
Baking soda rinses work similarly. Dissolve a teaspoon of baking soda in half a cup of warm water and swish. Baking soda neutralizes acids in the mouth that can irritate the sore, making it a good option if your mouth feels particularly raw. You can alternate between salt and baking soda rinses throughout the day.
Foods That Make Tongue Sores Worse
What you eat during a canker sore flare-up matters more than most people realize. Three categories of food consistently aggravate tongue ulcers and can delay healing:
- Spicy foods: Capsaicin, the compound that makes peppers hot, directly irritates open sores. This includes hot sauce, salsa, curry, sriracha, and anything seasoned with cayenne or chili powder.
- Acidic foods and drinks: Citrus fruits, tomatoes, pineapple, berries, vinegar, coffee, fruit juice, and alcohol all create a stinging or burning sensation on the ulcer and can slow the healing process.
- Hard or crunchy foods: Chips, pretzels, popcorn, granola, crackers, and crusty bread can scrape against the sore and reopen the wound.
Stick to soft, bland, cool foods while your tongue heals. Yogurt, scrambled eggs, mashed potatoes, smoothies (skip the citrus), and oatmeal are all easy on an open sore. Drinking through a straw can help liquids bypass the painful spot.
Switch to SLS-Free Toothpaste
If you get canker sores repeatedly, your toothpaste may be part of the problem. Sodium lauryl sulfate (SLS), the foaming agent in most toothpastes, is linked to more frequent and longer-lasting outbreaks. A pooled analysis of clinical trials found that people who switched to SLS-free toothpaste had roughly one fewer ulcer per outbreak, episodes that were about two days shorter, and significantly less pain compared to those using standard toothpaste.
SLS-free options are widely available at most pharmacies and grocery stores. Brands like Sensodyne, Biotene, and certain Arm & Hammer formulas skip SLS. Check the ingredients list if you’re unsure. This is one of the simplest changes you can make if canker sores keep coming back.
When a Canker Sore Needs Medical Attention
Minor canker sores, the kind most people get, are typically less than a centimeter across and shallow. They hurt, but they resolve on their own. Major aphthous ulcers are larger, deeper, and can take weeks to heal, sometimes leaving scars. These often need prescription-strength treatment, such as steroid-based gels or rinses that reduce inflammation more aggressively than anything available over the counter.
The key warning sign is a sore that won’t heal. Non-cancerous ulcers typically clear up within a few weeks. If a sore persists beyond that, keeps growing, or gets worse instead of better, it needs professional evaluation. A doctor or dentist will visually assess the area and feel for firm or unusually textured tissue. Oral cancers can mimic the appearance of a stubborn canker sore, so a sore that lingers deserves attention rather than more home remedies.
Nutritional Gaps Behind Recurring Sores
People who get canker sores frequently, not just once in a while but in recurring waves, sometimes have an underlying nutritional deficiency driving the pattern. The three most commonly implicated are vitamin B12, folate, and iron. Low levels of any of these can impair the body’s ability to maintain healthy tissue in the mouth lining, making it more vulnerable to ulceration.
You won’t necessarily feel other obvious symptoms of these deficiencies, which is why they’re easy to miss. If you’re getting canker sores every month or two, it’s worth asking your doctor to check these levels with a simple blood test. Correcting a deficiency through diet or supplementation can dramatically reduce how often sores appear. Foods rich in B12 (meat, fish, dairy, fortified cereals), folate (leafy greens, legumes, fortified grains), and iron (red meat, beans, spinach) all support oral tissue health.
Putting It All Together
The most effective approach combines several strategies at once. Apply a topical numbing gel early and often using the blot-and-swab method to keep it in place on the tongue. Rinse with saltwater or baking soda after meals. Avoid spicy, acidic, and crunchy foods until the sore closes. And if canker sores are a recurring problem for you, switch to an SLS-free toothpaste and consider whether a nutritional deficiency might be fueling the cycle. Most sores will be noticeably better within a week and fully healed within two.