Most minor mouth ulcers heal on their own in 10 to 14 days, but the right combination of treatments can cut that timeline significantly. Honey applied directly to the ulcer, for example, has been shown to reduce healing time to under three days in clinical trials. The key is acting early, keeping the ulcer clean, and choosing treatments that both relieve pain and promote tissue repair.
Why Mouth Ulcers Take So Long to Heal
Before the visible sore appears, you’ll often feel a tingling or burning sensation for a day or so. During this phase, the area reddens, small white bumps form, and then the tissue breaks open into an ulcer that expands over the next 48 to 72 hours. From there, the body begins slowly rebuilding tissue from the edges inward. The inside of your mouth is warm, wet, and full of bacteria, which makes healing slower than a cut on your skin. Every time you eat, drink, or talk, you’re disturbing the wound.
Minor ulcers (under 1 cm) typically resolve within 10 to 14 days without scarring. Major ulcers, which are larger and deeper, can persist for up to six weeks and sometimes leave scars. Most people deal with the minor type, and that’s where home treatment makes the biggest difference.
Apply Honey Directly to the Ulcer
Raw honey is one of the most effective home treatments available, and the data behind it is surprisingly strong. In a randomized controlled trial comparing honey to a prescription steroid paste, the honey group saw ulcer size reduction and healing in an average of 2.7 days, compared to 5.9 days for the steroid group and 7.1 days for a plain oral paste. Honey also outperformed the steroid for pain relief and redness reduction.
To use it, dab a small amount of unprocessed honey directly onto the ulcer three to four times a day, especially after meals and before bed. Try not to eat or drink for 15 to 20 minutes afterward so it stays in contact with the tissue. Honey works through a combination of anti-inflammatory and antimicrobial properties, and it creates a protective layer over the wound.
Rinse With Salt Water
A warm salt water rinse is the simplest way to keep a mouth ulcer clean and reduce bacteria around the wound. The recommended concentration is about one teaspoon of salt (roughly 5 grams) dissolved in a cup of water (250 ml). Swish gently for about two minutes, then spit. Doing this three times a day helps create an environment that’s less hospitable to bacteria without irritating the tissue further.
Salt water won’t dramatically speed healing on its own, but it prevents secondary infection, which is one of the main reasons ulcers stall or worsen. It’s also safe to combine with other treatments like honey or medicated gels.
Over-the-Counter Pain Relief Options
Benzocaine-based products like Orajel and Anbesol numb the ulcer on contact, which makes eating and drinking far more manageable. These gels and liquids vary in how long they last. In a controlled comparison of three benzocaine products, Red Cross Canker Sore Medication provided the longest and most intense numbing effect, though all three worked to some degree.
The numbing is temporary, so these products are best used strategically: before meals, before brushing your teeth, or whenever pain spikes. They don’t accelerate healing, but they reduce the constant irritation that comes from avoiding food or favoring one side of your mouth.
Chlorhexidine mouthwash is another option worth considering. It’s available over the counter in many countries and has been shown to reduce the severity and duration of ulcers by preventing bacterial buildup around the wound. It can temporarily stain teeth with prolonged use, but a short course during an active ulcer is generally fine.
When to Use a Steroid Treatment
For ulcers that are large, very painful, or keep coming back, topical corticosteroid pastes or rinses are the standard medical treatment. These work by suppressing the overactive immune response that causes the tissue damage in the first place. Steroid treatments are most effective when applied at the very first sign of tingling or burning, before the ulcer fully forms. Used during this early stage, they can sometimes stop the ulcer from developing at all.
For monthly or more frequent outbreaks with significant pain, the typical approach is a chlorhexidine mouthwash combined with a short course of topical steroid paste applied directly to the sore. People who only get ulcers a few times a year with mild discomfort often don’t need medication at all.
Laser Treatment at the Dentist
If you want the fastest possible resolution, low-level laser therapy offered by some dentists can dramatically accelerate healing. In a controlled trial, ulcers treated with a diode laser healed in an average of 3 days, compared to nearly 9 days in the untreated group. Perhaps more striking, 28 out of 30 patients experienced complete pain relief immediately after the laser session.
The procedure is quick, painless, and doesn’t require anesthesia. It’s not widely available everywhere and may not be covered by insurance, but it’s worth asking your dentist about if you deal with frequent or severe ulcers.
Nutrient Deficiencies That Cause Recurring Ulcers
If your ulcers keep coming back, the problem may not be in your mouth. Roughly 14 to 18 percent of people with recurrent mouth ulcers have an underlying nutritional deficiency, most commonly low levels of vitamin B12 and folate. Iron deficiency is another common culprit. In some cases, mouth ulcers and tongue inflammation are the only visible signs of these deficiencies, appearing before any other symptoms develop.
Studies have found that people with recurrent ulcers have significantly lower daily intake of both B12 and folate compared to those who rarely get them. When these deficiencies are corrected through diet or supplements, ulcer frequency and severity tend to improve. Foods rich in B12 include meat, fish, eggs, and dairy. Folate is found in leafy greens, legumes, and fortified grains. If your ulcers are a regular problem, a blood test for B12, folate, and ferritin levels is a reasonable step.
Switch to SLS-Free Toothpaste
Sodium lauryl sulfate (SLS) is the foaming agent in most toothpastes, and there’s solid evidence that it contributes to mouth ulcer outbreaks. A systematic review of four clinical trials found that switching to an SLS-free toothpaste significantly reduced the number of ulcers, the duration of each ulcer, the number of episodes per year, and the level of pain. The effect was consistent across all four studies.
SLS strips away the protective mucous layer inside your mouth, leaving the tissue more vulnerable to damage and irritation. Brands like Sensodyne, Biotene, and several others make SLS-free versions that are widely available. This is one of the easiest changes you can make, and for people with frequent ulcers, it often makes a noticeable difference within a few months.
Signs an Ulcer Needs Professional Attention
A typical mouth ulcer is painful but harmless. The red flag is duration. Any mouth sore that hasn’t healed after two weeks, even after removing obvious irritants like a sharp tooth edge or ill-fitting denture, should be evaluated by a dentist or doctor. A biopsy is strongly recommended for persistent lesions beyond that two-week window.
Other warning signs include ulcers that are red and white together, feel hard or fixed to deeper tissue, bleed easily, or grow rapidly. Ulcers that suddenly start appearing for the first time in adulthood can sometimes signal an underlying condition like inflammatory bowel disease or celiac disease, so new-onset recurrent ulcers in adults warrant a closer look beyond the mouth itself.