Most sores on the roof of your mouth heal on their own within two weeks, but you can speed up the process and reduce pain with a few simple strategies. The key is protecting the sore from further irritation while giving your body what it needs to repair the tissue.
What’s Causing the Sore
The most common culprit is a canker sore (aphthous ulcer), which typically appears as a white or yellow spot with a red border. These aren’t contagious and can be triggered by something as simple as biting the inside of your mouth, burning your palate on hot food, or irritation from dental work. Stress and acidic foods are also common triggers.
Less often, a sore on the palate can come from a fungal infection called oral thrush, which produces red and creamy white patches. This tends to show up after a course of antibiotics or when your immune system is weakened. If the sore looks unusual, doesn’t hurt, or has raised or rolled borders, that’s a different situation entirely and worth getting checked out promptly.
Salt Water Rinses
A warm salt water rinse is one of the most effective home treatments. Research on oral wound healing suggests mixing about one teaspoon of salt (5 grams) into a cup of water (250 ml). Swish it gently around your mouth for about two minutes, and repeat three times a day. Salt water helps clean the area, reduces bacteria, and promotes tissue repair without irritating the sore further.
Avoid mouthwashes that contain alcohol. They’ll sting and can actually slow healing by drying out the tissue.
Over-the-Counter Pain Relief
If the sore is painful enough to interfere with eating or talking, a topical numbing gel can help. Products containing benzocaine work by numbing the tissue directly. They come as gels, pastes, or liquids that you apply right to the sore. Benzocaine starts working in about one minute, which is faster than other topical anesthetics like lidocaine, which can take closer to three minutes to kick in.
Protective oral pastes can also form a barrier over the sore, shielding it from food and your tongue while it heals. Look for products specifically labeled for canker sores or mouth ulcers. Apply them after eating and before bed for the most benefit.
Foods to Eat and Avoid
What you eat matters more than you might expect. While the sore is healing, avoid foods and drinks that irritate the tissue:
- Acidic foods: citrus fruits, tomatoes, lemon juice, orange juice
- Spicy or salty foods
- Rough or crunchy textures: chips, crackers, nuts, hard toast
- Very hot foods and drinks
- Caffeinated and alcoholic beverages
Stick to soft, cool, or lukewarm foods instead. Yogurt, smoothies, mashed potatoes, scrambled eggs, and oatmeal are all gentle on the palate. Drinking through a straw can help liquids bypass the sore if it’s in a spot that gets hit every time you take a sip.
Nutritional Deficiencies and Recurring Sores
If you keep getting sores on the roof of your mouth, a nutritional deficiency could be the underlying cause. Recurrent mouth ulcers have been linked to low levels of iron, folate, vitamin B12, vitamin B3, and vitamin C. In documented cases, patients with recurring ulcers who were found to have low vitamin B12 levels experienced complete recovery within several weeks of supplementation.
This is especially worth considering if you follow a restrictive diet, have digestive issues that affect nutrient absorption, or notice other symptoms like fatigue or a sore tongue. A simple blood test can check your levels.
How Long Healing Takes
A typical canker sore heals within two weeks without any treatment. With good care (salt water rinses, avoiding irritants, protecting the sore), many people notice improvement within a week. Burns from hot food tend to heal even faster, usually in a few days to a week, because the damage is superficial.
The two-week mark is the important threshold. Any mouth sore that hasn’t healed after two weeks deserves professional evaluation. Self-limiting conditions like canker sores and minor burns almost always resolve within that window. A sore that lingers beyond it could indicate something that needs further investigation, particularly if it has raised borders, causes numbness or tingling, bleeds easily, or is accompanied by unexplained weight loss or difficulty swallowing.