Most tongue sores are canker sores, and they heal on their own within one to three weeks. But you can speed up healing and cut the pain significantly with a few targeted steps, starting today. The right approach depends on what type of sore you’re dealing with, so identifying it is the first move.
Figure Out What You’re Dealing With
Canker sores are the most common ulcerative condition in the mouth, making up the vast majority of tongue sores. They appear as small, round, whitish or yellowish ulcers with a red border, typically less than one centimeter across. They show up on soft tissue: the sides and underside of the tongue, inner cheeks, and inner lips. They are not contagious.
Cold sores (caused by herpes simplex virus) are different. They usually appear on the lips or just outside the mouth, start as fluid-filled blisters, and about 60% of the time are preceded by tingling or burning before you see anything. Cold sores inside the mouth are uncommon and tend to appear on the hard palate rather than the tongue. They are contagious.
Oral thrush looks like white patches you can wipe off, leaving red, raw skin underneath. It can cause a burning feeling or metallic taste and is most common in people with weakened immune systems, denture wearers, or those recently on antibiotics. Thrush requires antifungal treatment, so home remedies alone won’t resolve it.
White patches that you can’t wipe off, especially if painless and well-defined, could be leukoplakia. This occurs most often in men between 40 and 70 and carries a meaningful risk of precancerous changes, reported between 10% and 46% in studies. These need professional evaluation.
Saltwater Rinses and Other Home Treatments
A warm saltwater rinse is the simplest and most effective first-line treatment for canker sores. Mix one teaspoon of salt into eight ounces of warm water, swish for 30 seconds, and spit. If it stings too much, drop to half a teaspoon for the first day or two. You can rinse several times a day, especially after eating, to keep the area clean and reduce bacteria around the sore.
Baking soda rinses work similarly. Use one teaspoon in eight ounces of water. Both options help neutralize acids in your mouth that irritate the ulcer and slow healing. You can alternate between the two throughout the day.
Placing a small amount of milk of magnesia directly on the sore a few times daily can coat and protect it. Honey applied directly to the ulcer has also shown wound-healing properties. Ice chips held against the sore won’t speed healing, but they numb the area and reduce inflammation when the pain is interfering with eating.
Over-the-Counter Pain Relief
Topical numbing gels containing benzocaine can be applied directly to the sore for temporary pain relief. Apply to the affected area up to four times a day, and don’t use them for more than two consecutive days without professional guidance. These products work within minutes and make eating and drinking much more tolerable.
Over-the-counter mouth rinses designed for oral sores often contain hydrogen peroxide or other antiseptics that help keep the ulcer clean. Protective paste products create a barrier over the sore, shielding it from food, drinks, and your teeth. These are especially useful if the sore is in a spot that keeps getting bumped or rubbed.
What to Avoid While You Heal
Acidic foods like citrus, tomatoes, and vinegar-based dressings will sting and can prolong inflammation. Spicy foods, chips, crusty bread, and anything with sharp edges will physically irritate the sore. Hot beverages are another common aggravator. Stick to lukewarm or cool, soft foods until the sore closes up.
Your toothpaste may be making things worse. A systematic review of clinical trials found that toothpaste containing sodium lauryl sulfate (SLS), the ingredient that makes toothpaste foam, significantly increased the number of ulcers, the duration of each ulcer, and pain levels compared to SLS-free toothpaste. If you get tongue sores repeatedly, switching to an SLS-free toothpaste is one of the most evidence-backed preventive steps you can take. Several major brands sell SLS-free versions, usually labeled as “gentle” or “for sensitive mouths.”
Check for Nutritional Gaps
Recurrent tongue sores are often linked to nutritional deficiencies, particularly low levels of vitamin B12, iron, folic acid, and vitamin C. In documented cases, patients with recurring canker sores had vitamin B12 levels roughly half of what’s considered the low end of normal, and their sores resolved after supplementation.
If you get canker sores frequently (several times a year or more), it’s worth having your B12 and iron levels checked with a simple blood test. Vegetarians, vegans, people with digestive conditions that reduce nutrient absorption, and older adults are at higher risk for B12 deficiency. Eating more leafy greens, eggs, fortified cereals, and lean meats can help close these gaps over time, but a supplement may be needed if levels are genuinely low.
When a Tongue Sore Needs Professional Treatment
Minor canker sores heal within a few weeks without scarring. Major canker sores, those larger than one centimeter, can take months to heal and often leave scars. If you have a large, extremely painful sore that isn’t improving after two to three weeks, a prescription-strength steroid mouthwash or topical paste can reduce inflammation and accelerate healing. These work by suppressing the immune response that’s keeping the ulcer inflamed.
For cold sores, antiviral treatment works best when started at the first sign of tingling, before blisters form. If you recognize the prodrome, starting treatment within 24 hours can shorten the outbreak significantly.
Signs That Need Prompt Attention
Any sore in your mouth that doesn’t heal within two weeks deserves a professional look. This is the threshold that oral health specialists use to distinguish routine ulcers from something that may need a biopsy. Other warning signs include sores that bleed easily, rough or crusty patches on your gums or tongue, persistent numbness, or difficulty swallowing. A single non-healing ulcer is more concerning than multiple small sores that come and go, which is the typical canker sore pattern.
Preventing the Next One
Beyond switching to SLS-free toothpaste, a few habits reduce recurrence. Manage stress where you can, since canker sores often flare during high-stress periods. Avoid biting or injuring your tongue (ill-fitting dental appliances and accidental bites are common triggers). Keep up with B-vitamin and iron intake. Some people notice specific food triggers, with citrus, chocolate, coffee, and nuts being the most commonly reported. Tracking what you ate in the 24 hours before a sore appears can help you identify your personal triggers over time.