Most mouth sores heal on their own within one to two weeks, but the right combination of home care and over-the-counter products can cut pain significantly and speed up the process. What works best depends on the type of sore you’re dealing with, so identifying it is the first step toward the right treatment.
Figure Out Which Type of Sore You Have
The three most common types of mouth sores look and behave differently, and each responds to different treatments.
- Canker sores are small, round ulcers with a white or yellowish center and a red border. They appear inside the mouth, on the inner cheeks, tongue, gums, or soft palate. They are not contagious and typically heal within 7 to 14 days.
- Cold sores are fluid-filled blisters that form on or around the lips. They’re caused by herpes simplex virus, are contagious, and tend to recur in the same spot. They usually crust over and heal within 10 days.
- Oral thrush is a yeast infection that creates creamy white patches on the tongue, inner cheeks, or roof of the mouth. It can be wiped off, often leaving red, raw tissue underneath.
The treatments below focus primarily on canker sores, since they’re the most common reason people search for relief. Cold sores respond best to antiviral treatments, and thrush requires antifungal medication, so both of those warrant a trip to a pharmacy or doctor if they don’t resolve quickly.
Salt Water Rinse: The Simplest First Step
A warm salt water rinse is one of the most effective things you can do immediately. Mix 1 teaspoon of salt into 8 ounces of warm water until fully dissolved, then swish gently for 30 seconds and spit. If the sting is too intense, drop to half a teaspoon. Salt water acts as a mild antiseptic, reducing bacteria around the sore, calming inflammation, and promoting tissue repair. You can rinse three to four times a day, especially after meals.
Over-the-Counter Pain Relief
For sores that make eating or talking painful, topical numbing products containing benzocaine (sold under names like Orajel and Anbesol) can provide temporary relief by dulling the nerve endings around the ulcer. Apply directly to the sore with a clean finger or cotton swab. The effect typically lasts 30 to 60 minutes, enough to get through a meal comfortably.
Another option from the Cleveland Clinic: dab a cotton swab dipped in a 1:1 mixture of water and hydrogen peroxide onto the sore, then follow with a small amount of milk of magnesia. You can repeat this up to four times a day. The peroxide helps disinfect the area while the milk of magnesia coats and soothes it. Just be careful not to swallow the hydrogen peroxide.
Alcohol-free mouth rinses can also help keep the area clean without the burning sting of alcohol-based products, which tend to irritate open sores further.
Protective Patches and Barriers
One challenge with treating mouth sores is that saliva constantly washes away gels, pastes, and rinses before they can do much good. Mucoadhesive patches, available over the counter at most pharmacies, stick directly to the sore and create a physical barrier. This shields the ulcer from food, teeth, and tongue friction while delivering medication at a steady rate. Because the patch stays in place rather than dissolving in saliva, the active ingredients maintain contact with the tissue longer, which can translate to faster healing and more consistent pain relief compared to liquid or gel treatments.
When to Ask About Prescription Options
If your sores are large, unusually painful, or keep coming back, a doctor or dentist can prescribe a steroid dental paste. These pastes reduce inflammation directly at the sore. The typical application involves pressing a small amount onto the ulcer with a cotton swab to form a thin film, usually after meals and at bedtime. The key is to press, not rub. Rubbing causes the paste to crumble and lose contact with the tissue.
Some dental offices also offer low-level laser therapy for stubborn mouth sores. The treatment uses focused light to stimulate cellular energy production, which reduces pain and accelerates tissue closure. Animal studies have shown significantly faster wound healing with laser treatment, with complete healing in some cases by day 10. The procedure is quick and painless, though availability varies by practice.
Prevent Sores From Coming Back
Check Your Toothpaste
Many common toothpastes contain sodium lauryl sulfate (SLS), a foaming agent that can irritate the delicate lining of your mouth. A clinical study found four times fewer soft tissue lesions when participants used SLS-free toothpaste compared to a formula containing SLS. If you get canker sores frequently, switching to an SLS-free brand is one of the easiest changes you can make. Look for it on the ingredients list, typically near the top.
Address Nutritional Gaps
Recurring mouth sores are sometimes a signal that your body is low on specific nutrients. Vitamin B12 is essential for maintaining the integrity of the tissue lining your mouth. When levels drop, the oral lining becomes thinner and more sensitive, making ulcers more likely. Folate plays a similar role: it fuels the constant turnover of cells in your mouth lining, and a deficiency slows that renewal process, leaving tissue vulnerable to breakdown and sores.
You don’t necessarily need blood tests to act on this. Foods rich in B12 include meat, fish, eggs, and fortified cereals. Folate is abundant in leafy greens, beans, and citrus fruits. If your sores keep returning despite good oral hygiene, it may be worth having your levels checked, since supplementation can make a real difference for people who are genuinely deficient.
Watch for Physical Triggers
Biting your cheek, aggressive brushing, sharp edges on braces or dental work, and crunchy or acidic foods can all create the initial wound that becomes a canker sore. Switching to a soft-bristled toothbrush and being mindful of rough foods during an active outbreak helps prevent new sores from forming while existing ones heal. Stress is another well-documented trigger, so frequent sores during high-pressure periods aren’t a coincidence.