Saltwater rinses, over-the-counter numbing gels, and honey are among the most effective options for treating common mouth sores at home. Most mouth sores heal on their own within one to two weeks, but the right remedies can cut pain significantly and speed up recovery. What works best depends on the type of sore you’re dealing with.
Know Which Type You Have
The two most common mouth sores are canker sores and cold sores, and they require different treatment approaches. Canker sores (aphthous ulcers) appear inside the mouth as single, round white or yellow sores with a red border. They’re not contagious and have no confirmed cause, though they can be triggered by injury, stress, smoking, or deficiencies in folic acid, iron, or vitamin B12.
Cold sores (fever blisters) show up outside the mouth, typically around the border of the lips, as clusters of small fluid-filled blisters. They’re caused by herpes simplex virus type 1. An estimated 90 percent of U.S. adults carry the virus, which lives in nerve cells and periodically reactivates. Cold sores are highly contagious. If your sore is a cold sore, you’ll need an antiviral treatment rather than the remedies below, which are geared toward canker sores and general oral irritation.
Saltwater Rinse
A warm saltwater rinse is the simplest and most accessible home treatment. It helps clean the sore, reduce bacteria, and draw out some of the fluid causing swelling. The standard recipe is 1 teaspoon of salt dissolved in 8 ounces of warm water. If your mouth is particularly tender and the rinse stings, cut the salt to half a teaspoon for the first day or two. Swish gently for 15 to 30 seconds, then spit. You can repeat this several times a day, especially after meals, to keep the area clean while it heals.
Over-the-Counter Numbing Agents
Benzocaine gels, sprays, and ointments are the most widely available pain relievers for mouth sores. Products like Orajel and Anbesol contain benzocaine, which temporarily numbs the area on contact. Apply directly to the sore up to four times a day. The relief is short-lived, usually lasting 20 to 60 minutes, but it can make eating and drinking far more comfortable. Benzocaine lozenges are another option: dissolve one slowly in your mouth every two hours as needed.
For children under two, benzocaine products are not recommended. Look for age-appropriate alternatives or ask a pharmacist.
Honey as a Topical Treatment
Honey is one of the more surprising treatments with real clinical backing. In one study, patients who applied honey to canker sores four times a day for five days saw better outcomes than those treated with a prescription steroid cream or a standard benzocaine paste. The honey group had significantly faster reduction in ulcer size, fewer days of pain, and less redness around the sore.
Use plain, unprocessed honey. Dab a small amount directly on the sore after eating and before bed. It forms a protective coating that also has natural antibacterial properties. It won’t sting the way some medicated gels can.
Other Home Remedies Worth Trying
Several other options can provide relief, though the evidence behind them is less robust than for honey or numbing gels:
- Baking soda paste: Mix a small amount of baking soda with water to form a paste and apply it to the sore. This neutralizes acids in the mouth that can irritate the ulcer.
- Milk of magnesia: Dabbing a small amount on the sore a few times a day can coat and soothe it.
- Ice chips: Holding ice against the sore numbs the area temporarily and reduces inflammation.
- Hydrogen peroxide rinse: Dilute equal parts 3% hydrogen peroxide and water, apply with a cotton swab, and avoid swallowing. This helps keep the sore clean.
Prescription Options for Severe Sores
If your mouth sores are large, unusually painful, or keep coming back, a doctor or dentist can prescribe stronger treatments. Steroid mouth rinses reduce inflammation directly at the sore. These are typically swished around the mouth for several minutes, then spit out, three times a day during waking hours. You’ll be told not to eat or drink for about 15 minutes afterward so the medication stays in contact with the tissue.
Doctors also sometimes prescribe what’s informally called “magic mouthwash,” a custom-mixed rinse that typically combines a numbing agent, an antacid, and sometimes an antihistamine or antibiotic. There’s no single standard formula. At least 20 different formulations exist, which actually makes it hard to study. Some people find it very helpful, but results vary depending on the specific mix your doctor prescribes.
Preventing Mouth Sores
If you get canker sores frequently, a few changes can reduce how often they appear. Avoiding acidic or spicy foods during an active sore is obvious, but it also helps to identify whether certain foods trigger new ones. Citrus fruits, tomatoes, and sharp-edged chips or crackers are common culprits.
Switching to a toothpaste free of sodium lauryl sulfate (SLS), the foaming agent in most toothpastes, is a popular recommendation. Some earlier research suggested people who switched experienced up to a 70% reduction in ulcer frequency. However, a more controlled trial of 90 people who regularly suffered from mouth ulcers found no difference in ulcer count or frequency between SLS and SLS-free toothpaste over eight-week periods. It may help some individuals, but it’s not a guaranteed fix.
Nutritional deficiencies are a known trigger. If your sores are recurrent, it’s worth checking whether you’re getting enough iron, folic acid, and vitamin B12. A simple blood test can identify a deficiency, and supplementation often reduces flare-ups in people who are low in these nutrients. Stress management also matters, since stress is one of the most consistently reported triggers.
When a Mouth Sore Needs Medical Attention
Most mouth sores resolve within two weeks. That timeline is also the clinical threshold for concern. If a sore persists for two weeks or longer after any obvious irritant (like a sharp tooth edge or ill-fitting dental appliance) has been addressed, a biopsy is generally recommended to rule out something more serious, including oral cancer. Sores that are unusually large, spreading, accompanied by high fever, or making it difficult to drink fluids also warrant a prompt visit. The same applies if you’re getting frequent outbreaks with no clear cause.