Most mouth ulcers heal on their own within one to two weeks without any treatment. But if you’re dealing with one right now, you don’t want to wait that long in pain. The good news is that several remedies, both at home and over the counter, can speed healing and cut the discomfort significantly while your body does the repair work.
What Type of Ulcer You’re Dealing With
The vast majority of mouth ulcers are minor aphthous ulcers, small round sores less than 5 mm across with a white or yellowish center and a red border. These account for about 80% of all mouth ulcers and typically heal within one to two weeks without scarring.
Less common are major aphthous ulcers, which are larger than 10 mm and can take weeks or even months to heal, often leaving a scar. There’s also a third type called herpetiform ulcers, which appear as clusters of tiny pinpoint sores that heal within a month. The treatments below work for all three types, but major ulcers almost always need prescription-strength care.
Salt Water Rinse: The Simplest First Step
A warm salt water rinse is the easiest 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. This draws fluid out of the swollen tissue, easing discomfort and creating a less hospitable environment for bacteria. You can repeat this several times a day, especially after meals when food particles might irritate the sore.
Over-the-Counter Pain Relief
Numbing gels containing benzocaine are widely available at pharmacies and provide fast, temporary pain relief. Apply a small amount directly to the ulcer up to four times a day. The gel creates a protective coating over the sore, which also helps shield it from further irritation while you eat or talk. Look for products specifically labeled for oral use, as general skin formulations aren’t designed for the inside of your mouth.
Antiseptic mouth rinses containing chlorhexidine can also help. They don’t make ulcers go away faster, but they reduce pain and the severity of the sore by keeping the area clean and preventing secondary infection.
Honey Works as Well as Prescription Paste
If you’d rather avoid pharmacy products, honey is a surprisingly effective option. A randomized clinical trial compared honey applied three times daily to a standard prescription steroid paste. Both groups saw identical results: about a 60% reduction in ulcer size within the first few days, complete healing by the end of the treatment period, and the same degree of pain relief at every stage. The difference was that 10% of patients using the steroid paste experienced itching and redness, while the honey group had zero side effects.
To use this approach, dab a small amount of honey directly onto the ulcer three times a day. Try not to eat or drink for a few minutes afterward so it stays in contact with the sore. Regular store-bought honey works, though raw or medical-grade honey may offer additional antibacterial properties.
When You Need Prescription Treatment
If your ulcers are large, extremely painful, or keep coming back, a doctor or dentist can prescribe a topical corticosteroid paste or rinse. These work by calming the immune response that’s driving the inflammation. Lower-strength options are usually tried first, with stronger formulations reserved for stubborn or severe cases. These are applied directly to the ulcer, and none of the commonly used oral formulations affect your body’s broader hormone balance at the doses prescribed.
For people who get frequent outbreaks, the treatment focus shifts from healing individual sores to figuring out what’s triggering them in the first place.
Preventing Ulcers From Coming Back
Recurrent mouth ulcers often have identifiable triggers, and eliminating them can dramatically reduce how often you get sores.
Switch Your Toothpaste
Sodium lauryl sulfate (SLS) is a foaming agent in most toothpastes, and it’s one of the most well-documented ulcer triggers. In a clinical study, people who switched to an SLS-free toothpaste experienced roughly 60 to 70% fewer ulcers compared to when they used standard toothpaste. Several brands now make SLS-free formulas, and they’re easy to find online or in most pharmacies. This single change is one of the highest-impact things you can do if you get ulcers regularly.
Check for Nutritional Gaps
Deficiencies in vitamin B12, iron, and folate are closely linked to recurrent mouth ulcers. A clinical trial tested daily sublingual vitamin B12 tablets (1,000 mcg taken before bed) over six months in people with frequent outbreaks. If you suspect a nutritional gap, especially if you follow a restricted diet or have digestive issues that affect absorption, a simple blood test can confirm it and guide supplementation.
Watch for Patterns
Stress, lack of sleep, hormonal changes, and certain foods (citrus, tomatoes, spicy dishes, and chocolate are common culprits) can all trigger outbreaks. Keeping a brief log of what you ate and how you slept in the days before an ulcer appears can reveal patterns you’d otherwise miss. Physical trauma matters too. If you keep getting ulcers in the same spot, a sharp tooth edge, ill-fitting denture, or aggressive brushing habit could be the cause.
When a Mouth Ulcer Needs Medical Attention
Any mouth ulcer that hasn’t healed after three weeks should be evaluated by a doctor or dentist. UK cancer referral guidelines flag unexplained oral ulceration lasting longer than three weeks as a reason for urgent assessment, typically within two weeks. This doesn’t mean a persistent ulcer is cancer, but it does mean it shouldn’t be ignored. Other red flags include ulcers that are unusually large, painless (most benign ulcers hurt), spreading, or accompanied by unexplained weight loss, difficulty swallowing, or lumps in the neck.
Ulcers that keep returning in clusters or cycles may also point to an underlying condition like celiac disease, inflammatory bowel disease, or an immune system issue worth investigating with blood work.