Most sores on the roof of your mouth heal on their own within one to two weeks, but you can speed things along and reduce pain with a few simple strategies. The right approach depends on what caused the sore in the first place, so identifying the trigger helps you treat it effectively.
What’s Causing the Sore
The most common culprit is a thermal burn, often called “pizza palate,” from hot food or drinks. If the burn is severe enough, a bump or blister forms on the tissue. These typically heal fully in about a week without any special treatment.
Canker sores are another frequent cause. These round, whitish, open sores appear more often on the inner lips or cheeks, but they also form on the roof of the mouth. They can result from accidentally biting or scratching the tissue while chewing, or they can show up during periods of stress with no obvious physical trigger. Canker sores are not contagious.
Viral infections can also be responsible. Cold sores from the herpes simplex virus produce blisters on the lips and inside the mouth, including the palate. Hand, foot, and mouth disease, caused by coxsackievirus, creates painful sores in the mouth as well, particularly in children. Both tend to resolve within 7 to 10 days.
Salt Water Rinses: Your Best First Step
A salt water rinse is the simplest and most effective home treatment. It works by temporarily raising the pH inside your mouth, creating an alkaline environment where bacteria struggle to survive. Salt also draws excess fluid out of swollen tissue through osmosis, which reduces inflammation and helps the sore drain. On a cellular level, salt water promotes the migration of the cells responsible for wound repair, so it genuinely speeds healing rather than just masking symptoms.
Dissolve half a teaspoon of salt in 8 ounces of lukewarm water. Swish gently for 30 seconds, then spit. You can repeat this several times a day. If the soreness is mild after a day or two, you can increase to a full teaspoon of salt per 8 ounces. If the rinse stings too much at first, stick with the half-teaspoon ratio until the sore is less raw.
Pain Relief That Works Quickly
For immediate pain, sip something cold. Ice, frozen pops, or chilled applesauce all help numb the area. Milk is especially useful because it coats the inside of your mouth, providing a layer of relief that water can’t. Smooth, creamy foods like yogurt, ice cream, and pudding serve double duty: they soothe the sore and let you eat without aggravating it.
Over-the-counter numbing gels and ointments containing benzocaine (sold as Orajel and similar brands) can be applied directly to the sore up to four times a day. Don’t use these products for more than two days in a row without checking with a doctor or dentist. For broader pain and swelling, ibuprofen or acetaminophen taken by mouth works well alongside the topical approach.
Foods to Avoid While It Heals
Spicy and acidic foods are the biggest offenders. They won’t cause a new sore on their own, but they will irritate an existing one, increase pain, and can slow healing. That means holding off on hot sauce, citrus fruits, tomato-based sauces, vinegar-heavy dressings, and anything with a strong chili kick until the sore has closed up. Crunchy or sharp-edged foods like chips, toast, and raw vegetables can physically re-injure the tissue, so stick with soft foods while you’re healing. Drinking cool beverages through a straw helps bypass the sore entirely.
When Sores Keep Coming Back
Recurrent mouth sores, especially canker sores that return every few weeks, sometimes signal a nutritional gap. Low levels of vitamin B12, folate, or iron are all linked to recurring mouth ulcers. A simple blood test can check for these deficiencies, and correcting them often reduces or eliminates the cycle. If you notice sores appearing alongside fatigue, a sore or unusually red tongue, or pale skin, a deficiency is worth investigating.
Stress is another common driver of repeat canker sores. People who get them during high-pressure periods often find that managing stress through sleep, exercise, or other means reduces flare-ups over time.
Prescription Options for Severe Sores
If a sore is large, extremely painful, or slow to heal, a dentist or doctor may prescribe a medicated mouth rinse. These rinses typically combine a numbing agent, an anti-inflammatory ingredient, and sometimes an antifungal component. They’re most commonly used for patients dealing with severe or widespread oral sores, including those caused by chemotherapy or radiation therapy. For isolated but stubborn canker sores, a prescription-strength topical paste with a steroid component can reduce inflammation faster than anything available over the counter.
Sores That Need Professional Attention
Any mouth sore lasting longer than two weeks without improvement should be evaluated by a dentist or doctor. That two-week mark is the standard threshold used in clinical referral guidelines, because most benign sores resolve well before then. A sore that persists beyond that window, especially one that is painless, has irregular borders, or bleeds easily, needs to be examined to rule out oral cancer or other serious conditions. The same applies if you develop a sore alongside unexplained weight loss, difficulty swallowing, or numbness in part of your mouth.