Most mouth ulcers heal on their own within one to two weeks, but a handful of treatments can meaningfully cut both the pain and the healing time. Topical antiseptics, numbing gels, and corticosteroid pastes are the mainstay, while less obvious interventions like switching your toothpaste or addressing a vitamin deficiency can prevent ulcers from coming back. The science behind these treatments is more developed than many people realize, and the options range from drugstore gels to in-office laser therapy.
What Actually Works at the Drugstore
If you have a standard minor aphthous ulcer, the kind that shows up as a small, round, painful sore on the inside of your cheek, lip, or tongue, the first-line approach is straightforward. Antiseptic or anti-inflammatory topical agents and local anesthetics are the recommended starting point. If those are not enough, topical corticosteroids come next.1PubMed Central. The treatment of chronic recurrent oral aphthous ulcers That hierarchy matters: corticosteroids are effective, but you do not need them for every ulcer, and the simpler options handle most cases.
Among antiseptics, chlorhexidine rinses are one of the most widely studied. They reduce bacterial load at the ulcer site and can lower pain scores during the first few days. Sucralfate rinse, which forms a protective coating over the ulcer, has been shown to outperform chlorhexidine on both pain reduction and healing speed. In one trial, ulcers treated with sucralfate healed in an average of about two days, compared with roughly three days for chlorhexidine, a difference that was statistically meaningful.2PubMed Central. The Efficacy of Sucralfate and Chlorhexidine as an Oral Rinse in Patients with Recurrent Aphthous Stomatitis Either option is reasonable, but if you can get sucralfate (it often requires a prescription), it appears to have a slight edge.
Topical corticosteroid pastes, such as triamcinolone acetonide, work by tamping down the inflammatory response driving the ulcer. They are most effective when applied early, ideally at the first tingle or when the ulcer is very new. Waiting until the ulcer is fully formed and painful reduces the benefit. Most formulations are applied directly to the dried ulcer surface two to four times a day.
Numbing the Pain While You Wait
Pain is the main reason mouth ulcers disrupt your day, and topical anesthetics are the fastest way to address it. Lidocaine gel, available over the counter in many countries at a two percent concentration, provides reliable short-term numbness. A randomized, placebo-controlled trial found that a single application reduced pain roughly twice as much as placebo, with almost no adverse effects and tolerability rated “very good” in over 97% of patients.3PubMed Central. Efficacy and Safety of a Lidocaine Gel in Patients from 6 Months up to 8 Years with Acute Painful Sites in the Oral Cavity: A Randomized, Placebo-Controlled, Double-Blind, Comparative Study The relief is temporary, usually lasting 20 to 45 minutes, but that window is enough to eat a meal or brush your teeth comfortably.
Benzocaine gels work similarly and are widely sold under brand names like Orajel. A comparative study found benzocaine provided efficient numbing but somewhat slower overall recovery than lidocaine.4Journal of Neonatal Surgery. Investigating the Therapeutic Impact of Choline Salicylate Gel, Benzocaine, Lidocaine, Amlexanox, and Povidone-Iodine in the Treatment of Mouth Ulcers: A Comparative Study of Five Different Therapeutic Agents Both are safe for occasional use, though you should avoid applying benzocaine to infants or very young children due to a rare but serious risk of methemoglobinemia. For adults, the practical choice often comes down to which product is on the shelf at your pharmacy.
Silver Nitrate Cauterization
This one sounds medieval, but the evidence is surprisingly solid. A dentist or doctor applies a silver nitrate stick directly to the ulcer for a few seconds, chemically burning the nerve endings on the surface. The result is a sharp drop in pain: in a randomized controlled trial, about 70% of patients treated with silver nitrate reported reduced pain by the next day, compared with just 11% in the placebo group.5PubMed. Silver nitrate cautery in aphthous stomatitis: a randomized controlled trial That same trial found no significant difference in healing time by day seven, meaning silver nitrate is primarily a pain intervention, not a healing accelerator.
A second trial paints a slightly different picture, reporting that cauterized ulcers healed in an average of about two and a half days versus nearly six days in the placebo group, a significant difference.6Al-Qadisiyah Medical Journal. Use Silver nitrate cauterization in the treatment of aphthous stomatitis The discrepancy between the two trials probably reflects differences in ulcer size and timing of treatment. The takeaway: silver nitrate is a legitimate option for fast pain relief, and it may speed healing in some cases, but it does require a clinical visit and a few seconds of discomfort during the application itself.
Honey as a Treatment
Honey has antibacterial, anti-inflammatory, and antioxidant properties, and the research on its use for oral ulcers is more extensive than you might expect. A systematic review looking at 13 studies found that in 12 of them, honey reduced either the severity or the duration of oral ulcerative conditions compared with controls.7Exploratory Research and Hypothesis in Medicine. The Effect of Honey as a Treatment for Oral Ulcerative Lesions: A Systematic Review That is a remarkably consistent signal across different study designs and populations.
An animal study compared two honey delivery systems and found that a honey-based gel outperformed a mucoadhesive honey form, with measurable differences in wound healing by day three and day seven.8PubMed Central. Effect of two different delivery systems of honey on the healing of oral ulcer in an animal model Meanwhile, a randomized trial in children with chemotherapy-induced mouth sores found that honey significantly reduced both severity and pain compared with standard care.9PubMed. The efficacy of honey or olive oil on the severity of oral mucositis and pain compared to placebo (standard care) in children with leukemia receiving intensive chemotherapy: A randomized controlled trial (RCT)
There are caveats. The systematic review noted that Manuka honey specifically caused adverse effects and high dropout rates in one trial.7Exploratory Research and Hypothesis in Medicine. The Effect of Honey as a Treatment for Oral Ulcerative Lesions: A Systematic Review Not all honey is equal, and more concentrated or acidic varieties can sting on contact. If you want to try this at home, plain raw honey dabbed onto the ulcer a few times a day is the simplest approach. It is not a replacement for topical corticosteroids in severe cases, but for mild ulcers, the evidence is genuinely encouraging.
Low-Level Laser Therapy
This is a treatment you will not find at the drugstore, but it deserves mention because the results are striking. Low-level laser therapy uses a focused beam of light at low power to stimulate tissue repair and reduce inflammation. In a sham-controlled trial, ulcers in the laser group resolved in an average of about three days, versus roughly nine days in the sham group. Immediately after the laser session, 28 out of 30 patients reported complete pain relief.10PubMed Central. Efficacy of Low-Level Laser Therapy in Treatment of Recurrent Aphthous Ulcers – A Sham Controlled, Split Mouth Follow Up Study A separate study found that the therapy also reduced ulcer recurrence over time.11Indian Journal of Dental Research. Low level laser therapy in the treatment of aphthous ulcer
The catch is access and cost. Laser therapy is typically offered in dental offices or specialized clinics, and most insurance plans do not cover it for mouth ulcers. If you get frequent, painful ulcers and topical treatments are not cutting it, asking your dentist whether they offer this option is reasonable. The sessions are quick, painless, and have no reported serious side effects.
Switching Your Toothpaste
One of the most underappreciated triggers for recurrent mouth ulcers is sodium lauryl sulfate, or SLS, a foaming agent found in most commercial toothpastes. A systematic review pooling data from multiple trials found that people who switched to an SLS-free toothpaste had fewer ulcers, shorter episodes, and less pain.12PubMed. Effect of sodium lauryl sulfate on recurrent aphthous stomatitis: A systematic review An earlier study quantified the difference: ulcer counts dropped from an average of about 14 during an SLS-containing toothpaste phase to around five during an SLS-free phase.13PubMed. Sodium lauryl sulfate and recurrent aphthous ulcers. A preliminary study The proposed mechanism is that SLS strips away the mucin layer protecting the lining of your mouth, leaving the tissue more vulnerable to damage and ulceration.
SLS-free toothpastes are easy to find; many sensitive-teeth formulations already omit it. If you get ulcers more than a few times a year, switching toothpaste is one of the cheapest and lowest-risk changes you can make. Give it at least a month or two to see whether the frequency drops.
Food Sensitivities and Other Triggers
Beyond toothpaste, certain foods can set off ulcers in susceptible people. A study of patients with recurrent ulcers who had normal blood work found that 20 out of a group tested positive for clinically relevant food sensitivities, and 18 of those 20 improved after being advised to avoid the offending foods.14PubMed. Recurrent aphthous ulceration and food sensitivity Common culprits include acidic fruits like citrus and tomatoes, nuts, chocolate, and certain spices. There is no universal trigger list; it varies by person. If you notice ulcers appearing within a day or two of eating a specific food, an elimination trial is worth attempting.
Stress is the other big variable. A cross-sectional study of over 1,100 dental students found that roughly a third reported a history of recurrent ulcers, and about 27% of those linked the ulcers directly to stressful periods.15PubMed Central. Recurrent Oral Ulcers and Its Association With Stress Among Dental Students in the Northeast Indian Population: A Cross-Sectional Questionnaire-Based Survey Separately, research has shown that the relationship goes both ways: psychological distress triggers ulcer episodes, and the ulcers themselves worsen psychological distress, creating a cycle that feeds itself.16Frontiers in Oral Health. Factors influencing mental health and oral health-related quality of life in population with recurrent aphthous stomatitis: a cross-sectional study Telling someone to “reduce stress” is easier said than done, but knowing that the connection is real and documented can at least help you make sense of why ulcers cluster during exams, work deadlines, or other high-pressure stretches.
Vitamin Deficiencies Worth Checking
If you get ulcers frequently, a simple blood test could reveal part of the problem. A classic study of 130 patients with recurrent aphthous ulcers found that roughly 18% had a deficiency in vitamin B12, folic acid, or iron. When those patients received replacement therapy for their specific deficiency, 15 out of 23 went into complete remission and the remaining eight improved. That response rate was dramatically better than what was seen in patients without deficiencies who received only local symptom treatment.17The BMJ. Recurrent aphthae: treatment with vitamin B12, folic acid, and iron B12 and folic acid deficiencies tended to respond fastest; iron deficiency was slower to improve.
A more recent study confirmed the dietary side of this, finding that people with recurrent ulcers consumed significantly less vitamin B12 and folate than a comparison population. The shortfall in folate amounted to about 20% of the recommended daily intake.18PubMed Central. Reduced dietary intake of vitamin B12 and folate in patients with recurrent aphthous stomatitis This does not mean that B12 supplements will cure everyone’s ulcers; most people with recurrent ulcers are not deficient. But if you are, the fix is cheap and often dramatically effective. Ask your doctor to check your levels, especially if you follow a plant-based diet, have heavy menstrual periods, or have any reason to suspect malabsorption.
When to See a Doctor
Most mouth ulcers are harmless nuisances, but a few patterns warrant professional attention. The clearest red flag is any ulcer that does not heal within two to three weeks, even after removing obvious irritants like a sharp tooth edge or ill-fitting dental appliance. A painless, non-healing ulcer with hardened edges, a firm texture, or a crater-like appearance needs prompt evaluation to rule out oral cancer. Early-stage oral squamous cell carcinoma often presents without pain, which is precisely why painless ulcers are more concerning than painful ones.19Oral Oncology Reports. Red flags of oral cancer: Unravelling the early symptoms – A literature review
You should also see a clinician if ulcers are unusually large (bigger than about one centimeter), appear in clusters, recur very frequently, or are accompanied by fever, skin rashes, genital ulcers, or eye inflammation. These patterns can point to conditions like Behçet’s disease, celiac disease, or inflammatory bowel disease. Oral ulcers are among the most common mouth-related manifestations of Crohn’s disease, alongside angular cheilitis and gum inflammation.20PubMed Central. Oral Manifestations of Crohn’s Disease: A Systematic Review Herpes simplex infections inside the mouth can also look like aphthous ulcers, though they tend to appear on the hard palate or gums and often cluster, which helps distinguish them.21PubMed. The clinical characteristics of intraoral herpes simplex virus infection in 52 immunocompetent patients
Systemic Drugs for Severe or Refractory Cases
For the small percentage of people whose ulcers are large, deeply painful, constant, or unresponsive to everything described above, systemic medications enter the picture. Colchicine, originally developed for gout, is considered a first-line systemic option for complex or severe aphthous disease. It can reduce the number of lesions, relieve pain, and increase the gap between flare-ups.22PubMed Central. Colchicine in the treatment of refractory aphthous ulcerations: Review of the literature and two case reports An open trial of systemic treatments for severe recurrent ulcers found that colchicine benefited 90% of patients who received it, though only 40% achieved complete remission. Dapsone led to complete remission in over half of its group, while thalidomide produced complete remission in seven of eight patients, making it the most potent option tested.23Clinics. Systemic Treatment in Severe Cases of Recurrent Aphthous Stomatitis: An Open Trial
Thalidomide’s effectiveness comes with severe restrictions due to its well-known risk of birth defects, and it is generally reserved for cases linked to conditions like Behçet’s disease. Other immunosuppressive agents are similarly restricted to refractory or unusually severe disease.1PubMed Central. The treatment of chronic recurrent oral aphthous ulcers For most people, systemic treatment is never necessary. But knowing it exists matters if your ulcers have crossed the line from an occasional annoyance to something that genuinely interferes with eating, speaking, or daily life.
The Immune System Connection
Researchers have long suspected that aphthous ulcers are fundamentally an immune system problem rather than an infection, and genomic research increasingly backs this up. A large genome-wide study found strong associations between mouth ulcers and genes involved in T cell regulation, including pathways that control how certain immune cells activate, differentiate, and proliferate.24PubMed Central. Genome wide analysis for mouth ulcers identifies associations at immune regulatory loci In plain terms, people who get frequent ulcers may have immune cells that overreact to minor triggers like tissue irritation, stress hormones, or shifts in oral bacteria.
The oral microbiome itself plays a role. When the balance of bacteria in your mouth shifts, the mucosal barrier weakens, which can set the stage for ulceration.25PubMed Central. Oral microbiota dysbiosis accelerates the development and onset of mucositis and oral ulcers This helps explain why ulcers sometimes appear after illness, antibiotic use, or periods of poor oral hygiene. It also reinforces why antiseptic rinses and protective barriers can help: they support the mucosal environment rather than treating a specific pathogen.
Emerging Treatments on the Horizon
The current treatment landscape leans heavily on gels, rinses, and pastes, all of which wash away quickly in the wet environment of the mouth. Research is moving toward longer-lasting delivery systems. One recent study tested an electrospun nanofiber patch made from hyaluronic acid. In a rat model, a single application adhered firmly to the ulcer, reduced bacterial counts substantially, shortened the inflammatory phase, and achieved 95% tissue regeneration within six days, outperforming a commercially available oral film.26PubMed. Hyaluronic acid electrospun nanofiber patch for accelerated chronic recurrent oral aphthous ulcers This is still preclinical work, but the broader direction is clear: better adhesion and sustained drug release at the ulcer site is likely where treatment is headed. For now, though, the tools already available, from SLS-free toothpaste to lidocaine gel to a spoonful of honey, cover a wide range of severity and are effective enough that most ulcers do not have to be endured passively.