A canker sore on your tongue typically heals on its own within one to two weeks, but because the tongue moves constantly against teeth, food, and the roof of your mouth, these sores tend to hurt more and feel harder to ignore than ulcers elsewhere in the mouth. The good news is that several approaches can cut the pain and speed healing, from simple rinses you can make at home to over-the-counter gels and, for stubborn cases, prescription treatments. What matters most is starting early and avoiding the handful of everyday irritants that make tongue sores worse.
Immediate Pain Relief at Home
The first thing most people want is to make the pain stop long enough to eat a meal or get through a conversation. A warm saltwater rinse is the simplest starting point: dissolve about half a teaspoon of salt in a cup of warm water, swish gently for 30 seconds, and spit. This draws fluid out of the swollen tissue, temporarily reducing pressure on the nerve endings in the ulcer. You can repeat this several times a day, especially after meals when food debris sitting in the sore can make it sting.
A baking soda rinse works similarly and also helps neutralize acids in the mouth. Mix roughly a teaspoon of baking soda into a cup of water and swish. Some people alternate between salt and baking soda rinses throughout the day. Neither of these is a cure, but both create a less hostile environment for the sore while your body does the actual repair work.
Applying a small amount of honey directly to the ulcer is another home option with some clinical support. Honey has mild antibacterial and anti-inflammatory properties, and its thick consistency can form a temporary coating over the sore, shielding it from friction. Dabbing it on with a clean finger or cotton swab a few times daily, particularly before bed, is a low-risk approach worth trying.
Over-the-Counter Products That Help
If home rinses aren’t enough, drugstore shelves offer several categories of products designed for mouth ulcers. The most immediately effective are topical numbing agents containing benzocaine or lidocaine. These work by temporarily blocking nerve signals at the surface of the ulcer, and the relief usually kicks in within a minute or two of application. Gels tend to stay in place on the tongue better than liquids, so look for a gel formulation if the sore is in a spot that’s hard to keep dry.
Protective paste products that contain ingredients like benzocaine combined with an adhesive base can form a physical barrier over the sore. This barrier shields it from contact with food and teeth and lets the numbing agent sit in place longer. Apply these after drying the area as much as you can with a tissue or gauze, since saliva on the tongue’s surface makes it harder for the paste to stick.
Antiseptic rinses containing hydrogen peroxide in diluted form are another over-the-counter option. These help keep the ulcer clean and may reduce the bacterial load around it, which matters because secondary infection of a canker sore, while uncommon, can slow healing. Avoid using full-strength hydrogen peroxide straight from the bottle; a pre-mixed oral rinse or a 1:1 dilution with water is gentler on the surrounding tissue.
Prescription Treatments for Persistent Sores
When a tongue sore is large, extremely painful, or keeps coming back, a dentist or doctor may prescribe something stronger. Topical corticosteroids are the most common prescription approach. Triamcinolone acetonide and dexamethasone are both widely used, and in a comparative study, both reduced pain, ulcer size, and the number of ulcers over seven days, with no meaningful difference between them in any of those measures.1PubMed Central. A Comparative Study of Dexamethasone Ointment along with Triamcinolone Acetonide in Treatment of Recurrent Aphthous Stomatitis In practice, your provider will usually go with whichever formulation is easiest to apply to the location of your sore.
A broader look at the evidence, though, tempers expectations. A systematic review of randomized trials found that while triamcinolone acetonide shrank ulcer size and shortened healing time compared to several alternative treatments, it showed no clear advantage over placebo for pain relief or healing speed on its own.2PubMed Central. Effectiveness of 0.1% triamcinolone acetonide compared with those of other therapies for minor recurrent aphthous stomatitis: a systematic review and meta-analysis of randomized controlled trials That doesn’t mean the medication is useless, but it does suggest that topical steroids work best as part of a broader plan rather than as a silver bullet.
For severe or frequently recurring cases, doctors sometimes prescribe a short course of systemic medication, including oral corticosteroids or drugs that modulate the immune response. These come with more side effects and are reserved for situations where quality of life is significantly affected.
Switch Your Toothpaste
This is one of the easiest and most overlooked changes you can make. Most mainstream toothpastes contain sodium lauryl sulfate, commonly listed as SLS, which creates the foaming action people associate with a thorough clean. SLS is a detergent, and research on oral cells shows that it and similar detergents can reduce cell viability at the concentrations found in toothpaste.3PubMed. Toothpaste detergents: a potential source of oral soft tissue damage? That damage to the mucous membrane may make the tongue and inner cheeks more vulnerable to ulcers.
The clinical data backs this up. A systematic review found that switching to an SLS-free toothpaste reduced the number of ulcers, the duration of each episode, the number of recurrences, and the level of pain, all by statistically meaningful amounts compared to SLS-containing products.4PubMed. Effect of sodium lauryl sulfate on recurrent aphthous stomatitis: A systematic review If you get canker sores more than a couple of times a year, switching to an SLS-free toothpaste is one of the first things worth trying. Several brands market themselves as SLS-free; check the ingredient list rather than relying on front-of-package claims.
Foods and Drinks That Make It Worse
A canker sore on the tongue is essentially an open wound in one of the most sensitive and active parts of your body. Acidic foods like citrus fruits, tomatoes, and vinegar-based dressings aren’t just painful on contact; for some people, they may actually trigger new sores. One clinical investigation found that direct application of citric acid to the oral mucosa could reproduce canker sores in a susceptible patient but not in controls, and that avoiding foods containing citric and acetic acid led to marked relief.5Journal of Allergy. Canker sores from allergy to weak organic acids (citric and acetic): Case report and clinical study
Not everyone with canker sores has this sensitivity, but if you notice a pattern where sores show up after eating certain foods, it’s worth paying attention. Spicy foods, carbonated drinks, and rough-textured items like chips and crusty bread are common culprits too, less because of chemical irritation and more because they physically abrade the tongue’s surface. While a sore is active, sticking to softer, cooler, and blander foods makes a real difference in how tolerable the healing period is.
Nutritional Gaps Worth Checking
If you deal with canker sores repeatedly, your diet may be part of the problem. Several nutrient deficiencies are associated with recurrent oral ulcers, particularly low levels of vitamin B12, folate, and iron.6PubMed Central. Recurrent Oral Ulcers: Are They Horses or Zebras? A study comparing the diets of people with recurrent canker sores against national survey data found that the canker-sore group consumed significantly less vitamin B12 and folate, even after adjusting for overall calorie intake.7PubMed Central. Reduced dietary intake of vitamin B12 and folate in patients with recurrent aphthous stomatitis
This doesn’t mean that taking a B12 supplement will cure your canker sores, but if you follow a restrictive diet, are vegetarian or vegan, or suspect you might be low in any of these nutrients, a simple blood test through your doctor can identify a deficiency. Correcting it won’t necessarily eliminate sores entirely, but removing a contributing factor can reduce how often they show up.
The Stress Connection
Many people who get canker sores notice that outbreaks cluster around stressful periods: exams, work deadlines, family conflict, or poor sleep. This isn’t coincidence. Emotional stress can influence immune function and weaken the integrity of the oral mucosa, making it easier for ulcers to form and slower for them to heal. The tongue, with its constant movement and friction, is especially vulnerable when the body’s repair systems are running at reduced capacity.
Managing stress is easier said than done, but it helps to recognize the pattern. If you know a high-stress period is coming, doubling down on the basics, good sleep, avoiding known food triggers, using an SLS-free toothpaste, and keeping a gentle rinse routine, can sometimes head off a flare-up. Stress management alone won’t eliminate canker sores, but it removes one of the more consistent triggers from the equation.
When a Tongue Sore Needs Professional Attention
Most canker sores are minor and self-limiting. But there are situations where a sore on your tongue warrants a visit to a doctor or dentist rather than more home care. Pay attention if any of the following apply:
- Size: The sore is unusually large, roughly a centimeter or more across.
- Duration: It hasn’t started healing after two weeks.
- Frequency: New sores appear before old ones have healed, creating a near-constant cycle.
- Fever or swelling: You develop a fever, swollen lymph nodes, or spreading redness around the ulcer.
- No pain: Paradoxically, a painless ulcer on the tongue that doesn’t heal can be more concerning than a painful one, since canker sores are almost always painful.
Recurrent oral ulcers can sometimes be a sign of an underlying systemic condition. The standard list of possibilities includes autoimmune disorders like Behçet’s disease and lupus, gastrointestinal conditions like Crohn’s disease and celiac disease, and blood disorders involving low white cell counts.6PubMed Central. Recurrent Oral Ulcers: Are They Horses or Zebras? These are uncommon causes, but they’re worth investigating if your sores are frequent, severe, or accompanied by other symptoms like joint pain, skin rashes, or digestive problems.8Clinical and Experimental Immunology. Clinical Immunology Review Series: An approach to the patient with recurrent orogenital ulceration, including Behçet’s syndrome
It’s also worth knowing that not every sore on the tongue is a canker sore. Cold sores caused by herpes simplex virus can occasionally appear on the tongue, though they more commonly affect the lips. And very rarely, a persistent tongue ulcer can be something more serious. A healthcare provider can distinguish between these with an examination and, if needed, a biopsy.
Licorice and Other Natural Remedies
If you prefer to try something beyond standard drugstore products, topical licorice extract is the natural remedy with the most clinical support for canker sores. A systematic review of clinical trials found that licorice consistently reduced ulcer size and relieved pain across the studies examined.9PubMed Central. Topical Licorice for Aphthous: A Systematic Review of Clinical Trials The active compound, glycyrrhizin, has anti-inflammatory properties. Licorice-based products for oral use are available as dissolving patches, gels, and rinses. Look for deglycyrrhizinated licorice (DGL) in supplement form if you want to avoid the blood-pressure effects that high doses of glycyrrhizin can cause in some people.
Other natural remedies you’ll see mentioned include aloe vera gel, chamomile tea rinses, and sage mouthwash. These have limited but not zero evidence behind them, and they’re unlikely to cause harm when used topically in the mouth. The main caution is that if a natural remedy isn’t working after a few days, it’s worth moving to a proven over-the-counter option rather than waiting out a painful sore in the hope that an herbal approach will eventually kick in.
Why Some People Get Canker Sores and Others Don’t
If you’re the person in your friend group who always seems to have a canker sore while everyone else never gets them, genetics is likely part of the explanation. Research shows a higher prevalence of canker sores among relatives of affected individuals, and specific gene variations, particularly those involved in the body’s inflammatory signaling, may predispose certain families to recurrent ulcers.10PubMed Central. Recurrent aphthous stomatitis: genetic aspects of etiology If one or both of your parents dealt with frequent canker sores, you’re more likely to as well.
This genetic predisposition interacts with all the triggers discussed above: stress, diet, nutritional status, and local irritants like SLS. Two people might eat the same acidic meal, but only the one with a genetic tendency toward mucosal inflammation ends up with a sore the next morning. Understanding that you may be inherently more prone to canker sores can actually be freeing, because it shifts the focus from “what did I do wrong?” to “what can I control?” And the controllable factors, your toothpaste, your diet during vulnerable periods, your stress management, genuinely do make a difference even for people with a strong genetic component.
Canker Sores in Children
Canker sores commonly first appear during childhood or adolescence, and parents often worry about them more than they need to.11British Journal of Oral and Maxillofacial Surgery. Oral mucosal disease: recurrent aphthous stomatitis For younger children, the pain can be disruptive enough to interfere with eating and drinking, which is the main practical concern. Saltwater rinses work for kids old enough to swish and spit reliably, usually around age six or seven. For younger children who might swallow the rinse, a dab of honey on the sore can help, though honey should not be given to children under one year old.
Over-the-counter numbing gels designed for teething or mouth pain can be used in children, but check the product label for age restrictions, especially with benzocaine-containing products, which carry rare but serious risks in very young children. Cold foods like popsicles and smoothies can provide temporary relief and keep kids hydrated when they’re reluctant to eat. If a child’s canker sores are unusually large, frequent, or accompanied by other symptoms, a pediatrician should evaluate whether a nutritional deficiency or underlying condition could be involved. The same list of potential systemic causes that applies to adults, including celiac disease and iron deficiency, applies to children as well, and kids on restricted diets may be at particular risk.