Most tongue ulcers are canker sores (aphthous ulcers), and they heal on their own within two to three weeks. The goal of treatment is to reduce pain, avoid irritating the sore further, and speed up that natural healing process. Minor canker sores, the most common type, are usually smaller than a pea and resolve without scarring. Here’s what actually works.
Rinse With Salt Water or Baking Soda
A warm saltwater rinse is the simplest and most effective home treatment. It reduces mouth acid, keeps the area clean, and helps prevent infection. Mix 1 teaspoon of table salt and 1 teaspoon of baking soda into 4 cups of warm water. Swish gently for 30 seconds and spit. You can do this several times a day, especially after meals.
This combination works by neutralizing the acidic environment around the ulcer, which both eases pain and creates better conditions for healing. It won’t sting as much as you’d expect if the water is warm, not hot.
Use an OTC Numbing Gel
Over-the-counter products containing benzocaine (the active ingredient in Orajel and similar gels) temporarily numb the area so you can eat and talk more comfortably. Apply a small amount directly to the ulcer up to four times a day. Don’t use these products for more than two days in a row without checking with a healthcare provider, and avoid them entirely for children under two.
You can also find protective pastes that form a barrier over the sore, shielding it from food and your teeth. These work best when applied after meals and before bed.
Avoid Foods That Make It Worse
What you eat matters more than you’d think when you have an open sore on your tongue. Acidic and abrasive foods slow healing and intensify pain. Specifically, avoid:
- Citrus fruits and juices: oranges, lemons, limes, grapefruit, pineapple
- Tomato-based foods: marinara sauce, ketchup, salsa, tomato juice
- Spicy condiments: hot sauce, chili powder, horseradish, black pepper
- Carbonated and caffeinated drinks
- Alcohol
- Chocolate
- Vinegar-based dressings and pickled foods
Stick to soft, bland, cool foods while the ulcer heals. Yogurt, mashed potatoes, smoothies, and scrambled eggs are all easy on an open sore.
Switch Your Toothpaste
Many toothpastes contain sodium lauryl sulfate (SLS), a foaming agent that can irritate the lining of your mouth. People who get frequent canker sores often find that switching to an SLS-free toothpaste reduces both pain and the number of new sores they develop. Look for “SLS-free” on the label. Sensodyne ProNamel and some Tom’s of Maine varieties are common options.
While you’re healing, brush gently around the ulcer rather than directly over it. A soft-bristled toothbrush helps prevent further tissue damage.
Check for Nutritional Gaps
Recurrent tongue ulcers sometimes point to a nutritional deficiency. In a study of 273 patients with recurring canker sores, about 20% were deficient in iron, nearly 5% in vitamin B12, and close to 3% in folic acid. Anemia was present in roughly one in five patients. If you get tongue ulcers frequently, rather than just once in a while, it’s worth having your levels checked. A simple blood test can identify whether a deficiency is contributing to the problem, and correcting it often reduces how often sores come back.
Good dietary sources of these nutrients include red meat, leafy greens, eggs, fortified cereals, and legumes. A B12 supplement is particularly worth considering if you follow a vegetarian or vegan diet.
When Prescription Treatment Helps
If home remedies aren’t enough, a doctor or dentist can prescribe a steroid dental paste. This is applied directly to the sore after meals and at bedtime. You press a small amount onto the ulcer with a cotton swab to form a thin film. Don’t rub it in, as the paste becomes gritty and won’t stick properly. The steroid reduces inflammation and can significantly cut healing time for stubborn or large ulcers.
Major canker sores, those bigger than about one centimeter, can take months to heal and often leave scars. These are much less common but more likely to need prescription treatment.
How Long Healing Takes
The timeline depends on the type of ulcer. Minor canker sores typically heal within a few weeks without scarring. Herpetiform canker sores, a rarer type that appears as clusters of tiny pinpoint sores, usually resolve within about two weeks. Major canker sores are the outlier and can persist for months.
Pain tends to be worst in the first few days and gradually fades as the ulcer shrinks. If a tongue ulcer hasn’t healed after two weeks, schedule an appointment with your healthcare provider.
Signs That Need Medical Attention
The two-week mark is the key threshold. A canker sore that hasn’t started healing by then could be something other than a simple ulcer. Oral cancers can look similar to canker sores at first, but there are important differences. Canker sores are typically flat, painful from the start, and surrounded by red, inflamed edges. Oral cancers tend to be painless in their earliest stages and may have a small lump or bump beneath the surface that you can feel with your tongue or finger.
Watch for a small spot that grows larger over time, a white patch that turns red, or a lesion that starts bleeding when it previously didn’t. Canker sores get less painful as they heal. If a sore becomes more painful over time or changes in appearance, that’s a reason to get it looked at. Unlike cold sores, which appear on the outside of the lips and are caused by a virus, canker sores only develop on the moist surfaces inside the mouth and are not contagious.