Most mouth ulcers heal on their own within 10 to 14 days without scarring. But you can speed that process and reduce pain significantly with a few straightforward steps, starting with what you likely already have at home.
Saltwater Rinse: Your First Step
A warm saltwater rinse is the simplest and most effective thing you can do right now. Dissolve half a teaspoon of table salt in a glass of lukewarm water, swish it gently around your mouth for 30 seconds, and spit it out. Do this two to three times a day, especially after meals. The salt draws fluid from the inflamed tissue, easing swelling and creating an environment that helps the ulcer heal faster. It also loosens food debris that might otherwise irritate the sore.
Over-the-Counter Options That Work
If a saltwater rinse isn’t enough to manage your pain, over-the-counter products fall into two categories: numbing agents and protective coatings.
Topical gels containing benzocaine temporarily block nerve signals at the ulcer site, giving you relief for eating and drinking. Apply a small amount directly to the ulcer with a clean finger or cotton swab. These work within a minute or two but wear off, so you may need to reapply before meals.
Protective oral gels (sometimes sold as bioadherent pastes) take a different approach. They form a thin coating over the ulcer that physically shields the exposed nerve endings from contact with food, saliva, and your teeth. This barrier can make eating considerably more comfortable and may also protect the healing tissue from further irritation. Look for products labeled as oral wound rinses or protective mouth gels at your pharmacy.
For ulcers that are particularly inflamed, antimicrobial mouthwashes containing chlorhexidine can help keep the area clean and reduce the risk of secondary infection, which would slow healing.
Honey as a Topical Treatment
Applying honey directly to a mouth ulcer is more than a folk remedy. In one clinical observation of pediatric patients, those who used a manuka honey paste saw their oral ulcers heal within three days. Honey has natural antibacterial and anti-inflammatory properties, and its thick consistency helps it stay in contact with the sore. Dab a small amount onto the ulcer two or three times a day. Use raw, unprocessed honey when possible, and avoid eating or drinking for at least 15 minutes after application so it stays in place.
What to Avoid While Healing
What you keep away from the ulcer matters almost as much as what you put on it. Acidic foods like citrus fruits, tomatoes, and vinegar-based dressings will sting on contact and can extend healing time. Spicy foods, crunchy chips, and crusty bread physically irritate the open sore. Stick to softer, cooler foods while the ulcer is active.
Very hot drinks are another common aggravator. Let your coffee or tea cool to a comfortable temperature before sipping. Alcohol, including alcohol-based mouthwashes, can dry out and irritate the tissue around the ulcer. If you use mouthwash, choose an alcohol-free formula during this period.
Ice for Early-Stage Ulcers
Oral cryotherapy, which just means applying cold, is considered one of the easiest methods to treat a mouth ulcer during its initial stage. Sucking on ice chips or holding a small piece of ice against the sore numbs the area and reduces inflammation. This works best in the first day or two, when the ulcer is newly forming and most painful.
Nutritional Gaps That Cause Recurring Ulcers
If you get mouth ulcers frequently, the problem may not be local. It could be nutritional. Deficiencies in vitamin B12, folate, and vitamin C are all clinically linked to recurrent mouth ulcers. Low B12 (below 200 pg/mL in blood tests) and low folate (below 3 ng/mL) are the most commonly identified gaps. Vitamin C deficiency, diagnosed when plasma levels drop below 0.2 mg/dL, also plays a role.
You don’t necessarily need blood tests to act on this. If ulcers keep coming back, evaluate your diet for common sources of these nutrients. B12 comes primarily from animal products like meat, fish, eggs, and dairy. Folate is abundant in leafy greens, legumes, and fortified grains. Vitamin C is found in bell peppers, strawberries, broccoli, and citrus. If your diet is limited in any of these categories, a supplement or dietary shift may reduce how often ulcers appear.
Common Triggers to Watch For
Beyond nutrition, mouth ulcers are often triggered by mechanical trauma: accidentally biting your cheek, a sharp edge on a tooth or dental appliance, or vigorous brushing with a hard-bristled toothbrush. Switching to a soft-bristled brush and brushing more gently can prevent ulcers that keep forming in the same spot.
Stress is another well-documented trigger. Many people notice ulcers appearing during high-pressure periods at work or after poor sleep. Hormonal changes, particularly around menstruation, can also increase susceptibility. You may not be able to eliminate these triggers, but recognizing the pattern helps you start treatment earlier, when interventions like ice and protective gels are most effective.
There has been some interest in whether the foaming agent in toothpaste (sodium lauryl sulfate, or SLS) causes mouth ulcers. A 2019 review found there wasn’t enough evidence to confirm that switching to SLS-free toothpaste reduced ulcer frequency, duration, or pain. It’s worth trying if you suspect a connection, but the evidence so far is inconclusive.
How Long Healing Takes
The timeline depends on the type of ulcer. Minor aphthous ulcers, the small round sores most people get, typically heal in 10 to 14 days without leaving a scar. These are usually under a centimeter in diameter and, while painful, resolve on their own even without treatment. Home care mostly helps with pain and may shave a few days off the process.
Major aphthous ulcers are larger, deeper, and much more persistent. These can take weeks to months to heal and often leave scars. They’re less common but significantly more disruptive. A third type, herpetiform ulcers, appear as clusters of tiny sores that can merge together. Despite the name, they aren’t caused by the herpes virus.
When an Ulcer Needs Professional Attention
A mouth ulcer that hasn’t healed within two to three weeks warrants a visit to your dentist or doctor. The Oral Cancer Foundation notes that any oral lesion that doesn’t respond to normal treatment within this window should be evaluated further. A nonhealing ulcer is listed as an early sign of oral cancer, and a two to three week observation period is the standard timeline before a biopsy is considered.
Other reasons to seek evaluation: ulcers that keep returning in clusters, ulcers accompanied by fever, ulcers so large or painful that you can’t eat or drink adequately, or any ulcer that seems to be growing rather than shrinking. For persistent or severe cases, prescription-strength anti-inflammatory gels applied directly to the ulcer are typically the first step a clinician will try before considering other options.