Most mouth ulcers heal on their own within one to two weeks, but you can speed that process up and cut the pain significantly with a few straightforward treatments. The key is reducing irritation, managing inflammation, and giving the tissue what it needs to repair itself.
Immediate Pain Relief
Over-the-counter gels containing benzocaine, a local anesthetic, numb the ulcer on contact and make eating and drinking bearable. Apply the gel directly to the sore before meals. The numbness is temporary, so avoid chewing on that side of your mouth until sensation returns to prevent accidentally biting the area.
Antiseptic mouthwashes or gels designed for mouth ulcers can also form a protective barrier over the sore. Look for products labeled specifically for oral ulcers at your pharmacy, as they often combine a numbing agent with a coating ingredient that shields the wound from food and saliva acids.
Salt Water Rinses
A warm salt water rinse is one of the simplest and most effective things you can do. Dissolve half a teaspoon of salt in a glass of warm water, swish it around your mouth for 30 seconds, then spit it out. You can repeat this several times a day. Salt helps neutralize the oral environment around the ulcer and promotes wound healing. A study found that a 7 percent concentration of table salt improved wound healing effectiveness, supporting the idea that salt actively helps tissue repair rather than just keeping the area clean.
Honey as a Topical Treatment
Applying a small amount of honey directly to the ulcer is surprisingly well supported by evidence. A systematic review of 13 studies found that in 12 of them, honey reduced both the severity and duration of oral ulcers compared to control groups. Honey has natural anti-inflammatory and antimicrobial properties, and its thick consistency helps coat and protect the sore. Dab a small amount onto the ulcer a few times a day, ideally after eating and before bed.
Prescription Options for Stubborn Ulcers
If over-the-counter treatments aren’t cutting it, your doctor or dentist can prescribe a topical steroid paste. These work by reducing inflammation directly at the ulcer site, which shortens healing time and eases pain. They won’t prevent future ulcers from forming, but they can make a current outbreak much more manageable. Your provider will choose a strength appropriate to how severe the ulcer is.
Check Your Toothpaste
If you get mouth ulcers repeatedly, your toothpaste could be part of the problem. Sodium lauryl sulfate (SLS) is a foaming agent found in most mainstream toothpastes. It’s also a detergent that can irritate and even burn the delicate tissue inside your mouth. Research suggests that people prone to recurrent ulcers benefit from switching to an SLS-free toothpaste. Several brands market themselves as SLS-free, and the switch alone has resolved chronic ulcer problems for many people. Check the ingredients list on your current tube.
Nutritional Gaps That Cause Recurring Ulcers
Frequent mouth ulcers can signal a vitamin or mineral deficiency, particularly in B12, folate, or vitamin C. Each of these plays a distinct role in keeping your oral tissue healthy.
Vitamin B12 deficiency causes increased sensitivity of the mouth’s lining, leading to painful ulcers and a sore, inflamed tongue. This is one of the most common nutritional causes of recurrent ulcers. Folate deficiency produces a similar pattern: pale, fragile tissue inside the mouth that erodes easily into sores, often with a burning sensation. Vitamin C deficiency slows wound healing directly and makes gums bleed more easily, creating an environment where small ulcers form frequently and take longer to resolve.
If your ulcers keep coming back every few weeks, it’s worth asking your doctor for a blood test to check these levels. Correcting a deficiency with supplements often reduces or eliminates the cycle entirely.
What to Avoid While Healing
Acidic foods like citrus fruits, tomatoes, and vinegar-based dressings will sting and slow healing. Spicy food, crunchy chips, and crusty bread can physically irritate or reopen the sore. Stick to softer, blander foods until the ulcer closes. Alcohol-based mouthwashes can also burn the area, so switch to a gentle or alcohol-free rinse during an outbreak.
Canker Sore or Cold Sore?
These two get confused constantly, but the treatment is completely different. A canker sore (the common mouth ulcer) appears inside your mouth as a single round sore, white or yellow in the center with a red border. A cold sore appears on the outside of your mouth, usually around the lips, as a cluster of small fluid-filled blisters. Cold sores are caused by the herpes virus and require antiviral treatment. The remedies in this article are for canker sores, which are not contagious and not caused by a virus.
When a Mouth Ulcer Needs Medical Attention
A typical ulcer should be noticeably improving within a week and fully healed within two. If an ulcer persists for more than two weeks without healing, you should have it evaluated by a doctor or dentist. A sore that won’t heal is one of the warning signs of oral cancer, along with unexplained lumps inside the mouth, white or reddish patches on the tissue, persistent ear pain, or difficulty swallowing. These symptoms don’t automatically mean cancer, but they do warrant a professional exam. A biopsy, where a small tissue sample is taken for testing, is the standard way to rule out anything serious.
Ulcers that are unusually large (bigger than a centimeter), extremely painful, or accompanied by fever also deserve a visit to your healthcare provider rather than continued home treatment.