Most mouth ulcers heal on their own within one to two weeks, but the right care can cut down pain and speed that timeline. The key is reducing irritation, keeping the area clean, and using topical treatments that either numb the pain or protect the ulcer while it heals. Here’s what actually works.
What Type of Ulcer You’re Dealing With
About 80% of mouth ulcers are the minor type, less than 5 mm across, and they typically resolve within one to two weeks without scarring. These are the round, shallow sores with a white or yellowish center and a red border that show up on the inner cheeks, lips, tongue, or soft palate.
Major ulcers are larger (often over 10 mm), can take weeks or even months to heal, and sometimes leave scars. Herpetiform ulcers are clusters of tiny pinpoint sores that usually heal within a month. Knowing which type you have helps set realistic expectations. If you’re dealing with a standard minor ulcer, most of the strategies below should have you feeling better within a few days and fully healed within two weeks.
Salt Water and Baking Soda Rinses
The simplest first step is rinsing with warm salt water or a baking soda solution several times a day. For baking soda, the Mayo Clinic recommends dissolving 1 teaspoon in half a cup of warm water. For salt water, a similar ratio works well: about half a teaspoon of salt in a cup of warm water. Swish gently for 15 to 30 seconds, then spit.
These rinses don’t “cure” the ulcer, but they do two useful things. They temporarily raise the pH in your mouth, making the environment less hospitable to bacteria that can slow healing. And they help clear food debris away from the sore without the mechanical irritation of brushing directly over it.
Over-the-Counter Pain Relief
Topical numbing gels and liquids containing benzocaine are widely available and provide fast, temporary relief. You apply a small amount directly to the ulcer up to four times a day. The numbness kicks in within a minute or two and lasts long enough to eat or drink more comfortably. Children under two should not use benzocaine products.
Protective pastes that form a barrier over the ulcer are another option. Products containing hyaluronic acid work by creating a gel-like shield over the wound, keeping it hydrated and protecting it from further irritation by food, teeth, or saliva. Hyaluronic acid also helps reduce inflammation and supports the cell migration your body needs to close the wound. The tradeoff is that saliva gradually washes these gels away, so you’ll need to reapply, especially after eating or drinking.
Honey as a Topical Treatment
Applying a small amount of honey directly to a mouth ulcer is one of the better-supported natural options. A systematic review found that honey performed as well as standard medicated gels for reducing pain and ulcer size in people with recurring minor ulcers. For ulcers caused by chemotherapy or ill-fitting dentures, honey actually sped up recovery compared to controls.
Use plain, unprocessed honey. Dab it onto the ulcer a few times a day, ideally after meals and before bed. It creates a protective coating and has natural antibacterial properties. The taste is a bonus compared to most medicated pastes.
Prescription Options for Stubborn Ulcers
If over-the-counter treatments aren’t enough, your doctor or dentist can prescribe a steroid paste. These work by dialing down the inflammatory response that causes pain and swelling, which lets the tissue underneath repair itself faster. You apply the paste to a dried ulcer two to four times daily. Clinical trials show this approach reliably reduces pain, though results vary from person to person.
For people with frequent or severe outbreaks, prescription anti-inflammatory pastes can make a meaningful difference. In one large study, 21% of patients using a prescription paste achieved complete healing by day three, compared to just 8% of untreated patients. Your provider can also check whether an underlying issue, like a vitamin deficiency or immune condition, is driving recurrent ulcers.
Switch to SLS-Free Toothpaste
Sodium lauryl sulfate (SLS) is the foaming agent in most toothpastes, and it can irritate the delicate tissue inside your mouth. If you get ulcers frequently, switching to an SLS-free toothpaste is worth trying. Some early reports suggested up to a 70% reduction in ulcers with SLS-free products. A more controlled trial of 90 people found that the SLS-free toothpaste didn’t significantly reduce how often ulcers appeared, but participants reported less pain and slightly faster healing while using it.
That’s a modest benefit, but when you’re dealing with a painful sore, even a small edge matters. SLS-free toothpastes are easy to find at most pharmacies and cost about the same as regular options.
Foods and Habits to Avoid While Healing
What you eat can make the difference between an ulcer that fades quietly and one that lingers. Acidic foods like tomatoes, citrus fruits, and vinegar-based dressings directly irritate exposed tissue. Spicy foods, crunchy chips, and crusty bread cause mechanical damage to the sore. Hot drinks are another common aggravator.
Stick to soft, cool, or lukewarm foods while the ulcer is active. Yogurt, smoothies, scrambled eggs, and mashed potatoes are all easy on the mouth. If you drink through a straw, position it away from the sore. Avoid chewing on the side where the ulcer sits when you can. These adjustments feel minor, but reducing daily irritation gives the tissue a genuine chance to close up.
Preventing Ulcers From Coming Back
Recurring mouth ulcers often have identifiable triggers. Stress is one of the most common. Hormonal changes, lack of sleep, and nutritional gaps (particularly low iron, folate, zinc, or vitamin B12) also play a role. If your ulcers follow a pattern, tracking what happened in the days before an outbreak can help you spot your personal triggers.
Mechanical trauma is another frequent cause. Biting your cheek, a sharp edge on a tooth, or braces rubbing against soft tissue can all spark an ulcer. If one spot in your mouth keeps getting sores, mention it to your dentist. A minor adjustment to a filling, bracket, or denture can eliminate the problem entirely.
Signs an Ulcer Needs Professional Evaluation
A mouth ulcer that hasn’t healed after two weeks deserves attention. That two-week mark is clinically significant: ulcers caused by infection, inflammation, or minor trauma typically resolve within that window. Ones that persist beyond it may need a biopsy to rule out other conditions, including oral cancer.
Other warning signs include an ulcer that bleeds easily, feels hard or fixed to deeper tissue, grows rapidly, or has an unusual red and white color pattern. Ulcers that keep returning in the same spot, or that come with unexplained weight loss, fever, or difficulty swallowing, also warrant a visit to your doctor or dentist.