Most tongue sores heal on their own within one to two weeks, and simple home care can speed that process and cut the pain in the meantime. The right treatment depends on what’s causing the sore, so identifying the type you’re dealing with is the first step toward relief.
Figure Out What Kind of Sore You Have
The most common tongue sore is a canker sore: a single, round ulcer with a white or yellow center and a red border. Canker sores appear inside the mouth, on the tongue, inner cheeks, or lips. They aren’t contagious, and their exact cause is unknown, though stress, minor injuries (like biting your tongue), acidic foods, and nutritional deficiencies can trigger them.
Cold sores, caused by the herpes simplex virus (usually type 1), look different. They appear as clusters of small, fluid-filled blisters, typically on the outside of the mouth around the lips. They can occasionally show up on the tongue, but that’s less common. Unlike canker sores, cold sores are very contagious. The virus stays dormant in nerve cells and reactivates periodically.
A third possibility is oral thrush, a fungal infection that produces white, raised patches on the tongue and inner cheeks. Thrush is more common in people with weakened immune systems, those taking antibiotics, or denture wearers. It requires antifungal treatment rather than the home remedies that work for canker sores.
If you bit your tongue or burned it on hot food, the sore is simply a wound. Minor tongue bites heal in about six to seven days with basic wound care. Deeper lacerations that need stitches take closer to two weeks.
Home Treatments That Actually Help
A warm salt water rinse is the simplest and most reliable starting point. Mix one teaspoon of salt into one cup of warm (not hot) water, swish it around your mouth for five to ten seconds, then spit it out. Repeat several times a day, especially after meals. Salt water reduces bacteria around the sore and draws out fluid that contributes to swelling.
A diluted hydrogen peroxide rinse can also help clean the area. Use the standard 3% hydrogen peroxide sold in drugstores and mix two parts water to one part peroxide. Swish gently and spit. Anything stronger than 3% concentration risks irritating the tissue further.
For pain, over-the-counter oral gels containing benzocaine (sold under brand names like Orajel) can numb the sore temporarily. Apply a small amount directly to the ulcer with a clean finger or cotton swab. These provide short-term relief, usually lasting 20 to 30 minutes, which can make eating and drinking more manageable. Avoid reapplying too frequently, and follow the directions on the packaging.
Ice chips or cold water held against the sore can also dull pain without any medication. Some people find that coating the sore with a small amount of milk of magnesia a few times a day helps protect it from irritation and speeds healing.
What to Avoid While It Heals
Acidic and spicy foods are the biggest irritants. Citrus fruits, tomatoes, vinegar-based dressings, and hot sauces can all intensify pain and slow healing. Crunchy foods like chips and toast can physically re-injure the sore. Stick to soft, bland foods until the ulcer closes.
Very hot drinks are another common culprit. Let coffee and tea cool before drinking. Alcohol-based mouthwashes can sting and dry out the tissue around the sore, so switch to an alcohol-free version while you’re healing.
If you get canker sores frequently, consider switching to a toothpaste that doesn’t contain sodium lauryl sulfate (SLS), the foaming agent in most standard toothpastes. A meta-analysis of clinical trials found that people who used SLS-free toothpaste experienced significantly fewer canker sore episodes, shorter healing times, and less pain compared to those using regular toothpaste. Several major brands now sell SLS-free options.
When a Sore Needs Professional Treatment
Canker sores that are unusually large, extremely painful, or keep coming back may benefit from a prescription-strength treatment. One common option is a compounded rinse sometimes called “magic mouthwash,” which typically combines an antihistamine, a numbing agent, and an antacid suspension. You swish it around your mouth before meals to coat and numb the sore. Your dentist or doctor can prescribe this if over-the-counter options aren’t cutting it.
Thrush requires antifungal medication. The most common prescription is an antifungal oral suspension that you swish around your mouth and swallow. It won’t resolve on its own, so if you see creamy white patches that scrape off to reveal red tissue underneath, get it evaluated.
Cold sores on or near the tongue are treated with antiviral medication, which works best when started at the first sign of tingling or burning, before blisters fully form. If you’ve had cold sores before, you’ll likely recognize the early warning signs.
Nutritional Deficiencies Worth Checking
Recurrent tongue sores, especially when paired with fatigue, pale skin, or a persistently red or swollen tongue, can signal a vitamin B12 or folate deficiency. The NHS notes that a sore, red tongue with mouth ulcers is a recognized symptom of B12 or folate deficiency anemia. This connection holds even in people who haven’t developed full anemia yet. Iron deficiency can produce similar oral symptoms.
If your tongue sores keep returning without an obvious trigger like biting or acidic food, a blood test checking B12, folate, and iron levels is a reasonable next step. Correcting the deficiency, through diet changes or supplements, often reduces or eliminates the recurrent sores.
The Three-Week Rule
A standard canker sore heals within one to two weeks. A tongue bite closes in about a week. If a sore on your tongue hasn’t healed after three weeks, clinical guidelines in the UK and elsewhere recommend an urgent referral to a specialist to rule out oral cancer. This is especially important if the sore is painless, hard to the touch, or accompanied by a lump in the neck. Most persistent sores turn out to be benign, but the three-week mark is the established threshold for getting it checked.