Most canker sores heal on their own within one to two weeks, but the right combination of pain relief, rinses, and dietary changes can cut that timeline shorter and make the wait far more bearable. Whether you’re dealing with a single sore or recurring outbreaks, there are effective options at every level, from kitchen-shelf remedies to prescription treatments.
Topical Pain Relief Products
The fastest way to get relief from a canker sore is to apply a numbing gel or paste directly to it. Over-the-counter products containing benzocaine (sold as Anbesol, Orabase, and Zilactin-B) temporarily block pain signals at the sore’s surface. They work best when applied as soon as you notice the sore forming. You can reapply several times a day, especially before meals.
Hydrogen peroxide rinses designed for mouth sores (like Orajel Antiseptic Mouth Sore Rinse) serve a dual purpose: they clean the ulcer and create a mildly hostile environment for bacteria that could slow healing. Look for alcohol-free mouth rinses, since alcohol stings open tissue and can dry out the surrounding area, making things worse.
Simple Rinses You Can Make at Home
A saltwater rinse is one of the oldest and most reliable remedies. Mix about half a teaspoon of table salt into a cup of warm water, swish it around your mouth for 30 seconds, and spit. The salt draws fluid out of the swollen tissue, which reduces inflammation and pain. Repeating this three or four times a day, especially after eating, keeps the area clean without irritating it further.
Baking soda works similarly. Dissolve a teaspoon in half a cup of warm water and use it the same way. Baking soda neutralizes acids in your mouth, which matters because acidic saliva and food residue are two of the main things that make canker sores sting.
Foods That Make Canker Sores Worse
What you eat during an outbreak has a big impact on both pain levels and healing speed. Acidic foods top the list of irritants. Citrus fruits and juices (oranges, lemons, grapefruit), tomatoes and tomato-based sauces, strawberries, coffee, and carbonated drinks all lower the pH in your mouth and directly aggravate the exposed tissue of a canker sore.
Spicy foods, including hot peppers, curry, and salsa, inflame sensitive oral tissue and can trigger new sores in people who are prone to them. Rough, sharp-edged foods like chips, pretzels, nuts, and seeds cause tiny abrasions inside your mouth that create new sites for sores to develop, or reinjure a sore that’s trying to heal.
Some people also notice flare-ups after eating chocolate, which contains a compound called theobromine that can cause oral irritation in sensitive individuals. Dairy proteins trigger inflammation for some people as well, though this varies widely. If you get canker sores frequently, keeping a food diary for a few weeks can help you identify your personal triggers.
Nutritional Gaps That Fuel Recurring Sores
If canker sores keep coming back, the problem may be nutritional rather than situational. Deficiencies in iron, vitamin B12, folic acid, and zinc are all linked to recurrent outbreaks. These nutrients play key roles in maintaining the mucous membranes that line your mouth. When levels drop, that tissue becomes more fragile and slower to repair itself.
You don’t necessarily need high-dose supplements. For many people, simply eating more leafy greens (rich in folate), lean red meat or fortified cereals (iron and B12), and seeds or legumes (zinc) is enough to close the gap. If your sores are frequent and severe, a blood test can reveal whether a specific deficiency is driving the problem, which makes targeted supplementation far more effective than guessing.
Switching to SLS-Free Toothpaste
Sodium lauryl sulfate, commonly listed as SLS, is the foaming agent in most toothpastes. It’s also a known irritant to the delicate lining of the mouth. A meta-analysis of clinical trials found that people who switched to SLS-free toothpaste experienced roughly one fewer ulcer per outbreak cycle, and their sores healed about two days faster on average. They also had fewer total episodes and reported less pain compared to those using standard toothpaste.
SLS-free toothpastes are widely available. Brands like Sensodyne, Biotene, and several others sell formulas without it. Check the ingredients list on the back of the tube. This is one of the simplest long-term changes you can make if you get canker sores regularly.
Prescription Options for Severe Sores
When over-the-counter products aren’t enough, prescription-strength treatments step in. Fluocinonide is a topical steroid available as a gel that reduces inflammation and pain more aggressively than anything on the drugstore shelf. It’s typically applied directly to the sore a few times a day. For widespread or especially painful outbreaks, a dentist or doctor may prescribe a steroid mouth rinse that coats the entire mouth.
Chemical cautery is another option. A healthcare provider applies a cauterizing agent directly to the sore, which destroys the damaged nerve endings on the surface. This can provide near-instant pain relief, though the tissue still needs time to heal underneath.
Laser Treatment for Fast Relief
Low-level laser therapy is a newer option offered by some dental offices. A small laser is applied to the canker sore for a few minutes, and the results are notably fast. In clinical studies, nearly 90% of patients treated with laser therapy were free of pain and redness by the second day. By comparison, only about 55% of patients using topical ointments reported pain relief by day five. Patients treated with laser were able to eat, drink, and brush their teeth normally within three days of treatment.
Laser treatment isn’t widely available everywhere, and it typically costs more than a tube of gel. But for people who get large, painful, or stubborn sores that interfere with eating and speaking, it’s one of the most effective options currently available.
Everyday Habits That Prevent Outbreaks
Beyond treating individual sores, a few consistent habits can reduce how often they appear. Avoid biting the inside of your cheeks or lips, which is one of the most common physical triggers. If you have braces or a dental appliance with a rough edge, dental wax can protect the tissue it rubs against.
Stress is a well-established trigger for canker sores. Many people notice outbreaks during exam periods, work deadlines, or emotionally difficult stretches. Managing stress through sleep, exercise, or whatever works for you can genuinely reduce how often sores appear. Keeping your mouth hydrated also helps. Dry oral tissue is more vulnerable to small injuries and slower to heal, so drinking water throughout the day offers a simple layer of protection.