Most minor mouth ulcers heal on their own within 10 to 14 days, but the right combination of home treatments can cut pain significantly and help them close faster. The key is reducing irritation, keeping bacteria in check, and protecting the raw tissue so your body can repair it without interference.
What Actually Speeds Up Healing
There’s no overnight cure for a mouth ulcer, but several approaches have solid evidence behind them. The most effective strategy combines something to numb the pain with something to protect the ulcer surface and reduce inflammation.
Topical honey is one of the best-supported home remedies. In a clinical trial comparing honey to a prescription steroid paste, both treatments reduced ulcer size by about 60% within the first few days, with complete healing by the follow-up visit. Honey actually performed better at reducing the burning sensation (55% reduction versus 30% for the steroid paste), and none of the honey users experienced side effects, while 10% of the steroid group reported itching and redness. Apply a small amount of raw honey directly to the ulcer three times a day. It forms a protective barrier, fights bacteria, and reduces inflammation all at once.
Over-the-counter numbing gels containing benzocaine provide direct pain relief by temporarily blocking nerve signals at the ulcer site. These are especially useful before meals, since eating is when most people feel the worst discomfort. Apply them directly to the sore as directed on the packaging.
Salt Water Rinses: Simple and Effective
A warm salt water rinse is one of the fastest things you can do right now. Mix one teaspoon of salt into eight ounces of warm water and swish gently for 30 seconds. If that stings too much, drop to half a teaspoon for the first day or two. Salt water kills bacteria through osmosis, pulling water out of bacterial cells. It also shifts the pH inside your mouth to a more alkaline environment where harmful bacteria struggle to survive. Rinse two to three times a day, especially after eating.
Protect the Ulcer From Irritation
The single biggest thing slowing your ulcer down is repeated irritation. Every time acidic or spicy food touches that raw tissue, it disrupts the healing process. During the first several days, stick to soft, cool foods and avoid anything sharp or crunchy that could physically scrape the sore. Drinking cool beverages through a straw can help bypass the ulcer entirely.
Common triggers to avoid until healing is complete: citrus fruits and juice, tomato-based sauces, vinegar, hot peppers, chips or crusty bread, and very hot drinks. These don’t just cause pain in the moment. They actively delay the regrowth of tissue over the ulcer surface.
When Prescription Treatment Helps
If over-the-counter options aren’t cutting it, prescription corticosteroid pastes can reduce the number of days an ulcer sticks around. These work by calming the inflammatory response that keeps the sore angry and swollen. They don’t prevent future ulcers, but they can meaningfully shorten the lifespan of a current one while reducing pain. Your dentist or doctor can prescribe these for ulcers that are unusually large or painful.
Deglycyrrhizinated licorice (DGL), available as gels and oral patches, is another option gaining traction. It has anti-inflammatory and mucosal protective properties without the side effects that come with steroids. You can find DGL products at most health food stores.
Check for Nutritional Gaps
If you’re getting mouth ulcers repeatedly, the problem may not be local. It could be systemic. Deficiencies in vitamin B12, folate, and iron are all linked to recurrent mouth ulcers. B12 or folate deficiency can cause a sore, red tongue along with ulcers that keep coming back. If this sounds familiar, a simple blood test from your doctor can identify whether a nutritional gap is driving the cycle. Correcting the deficiency often reduces or eliminates recurrences.
Minor Versus Major Ulcers
Most mouth ulcers are the minor type: small, round, and painful but ultimately self-limiting within about two weeks. Major ulcers are a different situation. These exceed one centimeter in diameter, can appear on tougher tissue in the mouth, take up to six weeks to heal, and sometimes leave scars. If your ulcer is unusually large, deep, or has been growing rather than shrinking, it falls into this category and likely needs professional treatment to heal properly.
Signs That Need Professional Attention
A mouth sore that hasn’t healed after two weeks warrants a visit to your doctor or dentist. Oral cancer can initially look like an ordinary ulcer: a persistent sore, a white or reddish patch, or a lump inside the mouth. Other warning signs include unexplained loose teeth, ear pain, or difficulty swallowing. Persistent sores are usually still just stubborn ulcers, but a two-week threshold is when clinicians recommend getting it checked. If anything looks unusual, a small tissue sample can rule out something more serious quickly.