Most mouth sores heal on their own within one to two weeks, but the right combination of rinses, topical treatments, and habit changes can cut that timeline shorter and reduce pain almost immediately. The key is starting treatment early, keeping the area clean, and avoiding anything that irritates the sore further.
Salt Water and Baking Soda Rinses
The simplest and cheapest remedy is one you can make right now. Dissolve 1 teaspoon of baking soda in half a cup of warm water and swish it around the sore for 15 to 30 seconds before spitting it out. A basic salt water rinse works similarly: half a teaspoon of salt in a cup of warm water. Both options reduce bacteria around the sore, lower inflammation, and create an environment that supports faster healing.
Do this three to four times a day, especially after meals. Food particles sitting against an open sore slow healing and increase pain, so rinsing after eating does double duty. You can alternate between salt water and baking soda rinses throughout the day if one feels more soothing than the other.
Over-the-Counter Pain Relief Gels
Numbing gels and pastes containing benzocaine are the fastest way to get pain relief. You apply a small amount directly to the sore, and the area goes numb within a minute or two. The effect typically lasts 30 minutes to an hour, which makes eating and drinking far more comfortable. Look for products labeled for oral pain or canker sores at any pharmacy.
Protective pastes work differently. Instead of numbing, they form a barrier over the sore that shields it from food, drinks, and your teeth. This both reduces pain and lets the tissue heal without constant irritation. Some products combine numbing and protective ingredients. Antiseptic rinses containing hydrogen peroxide (diluted, not straight from the bottle) can also help keep the sore clean, though they sting on contact.
Honey as a Healing Agent
Applying honey directly to a mouth sore is a well-studied home remedy. In clinical comparisons, honey applied three times daily for five days performed as well as standard medicated gel for both pain reduction and ulcer size. Participants reported noticeable improvement and no side effects. Honey has natural antibacterial and anti-inflammatory properties, and its thick consistency acts as a protective coating over the sore.
Raw honey or manuka honey tend to be recommended most often. Dab a small amount onto the sore with a clean finger or cotton swab after meals and before bed. It won’t taste bad, and the coating stays in place longer than you’d expect.
What to Avoid While Healing
Half of speeding up healing is stopping the things that slow it down. Acidic foods like tomatoes, citrus, and vinegar-based dressings irritate the sore and can restart inflammation each time you eat. Spicy foods, crunchy chips, and hard toast physically scrape the ulcer. Hot beverages can increase pain and swelling.
Stick to soft, cool, or lukewarm foods while the sore is active. Yogurt, smoothies, scrambled eggs, and mashed potatoes are all safe choices. If you use a toothpaste containing sodium lauryl sulfate (check the ingredients list), consider switching to one without it. This foaming agent is a known trigger for recurrent mouth sores in some people, and eliminating it can reduce how often sores come back.
Ice for Immediate Pain Relief
Letting a small ice chip dissolve slowly against the sore numbs the area and reduces swelling. This won’t speed healing directly, but it provides quick, drug-free pain relief when you need it. It’s especially useful right before meals if you don’t have a numbing gel on hand. You can also try sucking on frozen fruit bars for the same effect with less intensity.
Vitamin Deficiencies and Recurrent Sores
If you get mouth sores repeatedly, a nutritional gap may be the underlying cause. Deficiencies in vitamin B12, folate, iron, and zinc are all linked to recurrent canker sores. A clinical trial studying daily sublingual B12 supplements (1,000 mcg taken before bed for six months) was designed specifically to test whether correcting this single deficiency could break the cycle of recurring sores.
You don’t necessarily need supplements. Foods rich in B12 include meat, fish, eggs, and fortified cereals. Folate comes from leafy greens, beans, and citrus. If your sores keep coming back every few weeks, it’s worth asking for a blood test to check these levels. Stress and minor injuries to the mouth (biting your cheek, aggressive brushing) are the other common triggers worth addressing.
Professional Treatments That Work Faster
For sores that are unusually large or painful, a dentist or doctor can offer treatments that outperform anything available at home. Laser therapy is one option: a low-level laser applied to the sore significantly reduces pain immediately and over the following one to three days, while also shortening total healing time. The procedure is quick, often done in a single session, and isn’t painful.
Prescription-strength topical treatments, including steroid pastes and specialized mouth rinses, are another step up. These suppress the inflammatory response driving the sore and can be particularly helpful for people who get large or multiple sores at once.
Signs a Mouth Sore Needs Medical Attention
Any mouth sore lasting 10 days or more needs to be examined by a dentist or doctor to rule out something more serious, including precancerous changes. Seek care sooner if you have a fever, blisters appearing on your skin, eye inflammation, or a weakened immune system. If the sore doesn’t hurt much but simply won’t heal, that’s actually more concerning than a painful one that clears up on schedule.
Multiple sores appearing at once, sores that are unusually large (bigger than a pencil eraser), or pain severe enough to prevent eating or drinking also warrant a professional visit within a few days rather than waiting it out.