Learn About Treating Mouth Ulcers at Home

Understanding Mouth Ulcers: What They Are and Why They Form

Mouth ulcers, also called canker sores or aphthous stomatitis, are small, painful sores that develop inside your mouth. They typically appear on the inside of your cheeks, lips, gums, tongue, or the floor of your mouth. Most mouth ulcers are round or oval with a white or yellowish center surrounded by a bright red, inflamed border. They usually range from 2 to 8 millimeters in diameter, though some can grow larger.

According to research published in the Journal of Dental Research, approximately 20% of the population experiences mouth ulcers at some point in their lives. For some people, they occur frequently—several times per year. Others may go years without developing one. The pain associated with mouth ulcers can range from mild irritation to significant discomfort that makes eating, drinking, and speaking difficult.

Mouth ulcers form for several reasons. Common triggers include minor injuries from dental work, aggressive tooth brushing, accidentally biting your cheek, or sharp edges from broken teeth or dental appliances. Other causes include nutritional deficiencies (particularly B12, zinc, folate, and iron), certain foods like citrus fruits or spicy dishes, stress and lack of sleep, hormonal changes during menstrual cycles, and mouth irritation from certain mouthwashes or toothpastes containing sodium lauryl sulfate. Some individuals develop ulcers due to oral thrush, herpes simplex virus, or other infections. In rare cases, frequent or severe ulcers may indicate autoimmune conditions or other underlying health concerns.

Most common mouth ulcers heal within 1 to 3 weeks without leaving scars. However, they can be quite painful during the healing process. Understanding what causes your ulcers can help you take steps to prevent future occurrences.

Practical Takeaway: Keep a simple log of when you develop mouth ulcers and what you were eating or doing beforehand. Over time, you may notice patterns—certain foods, stress periods, or dental habits—that seem to trigger your sores. This information can guide your prevention efforts.

Rinsing and Cleansing Techniques for Pain Relief

One of the most straightforward home treatments for mouth ulcers involves rinsing your mouth with solutions that reduce pain and promote healing. Gentle rinsing helps keep the area clean, removes food debris, and can provide soothing relief. The key is using the right solution and technique without causing further irritation.

Saltwater rinses are among the most widely recommended home remedies. Mix one-half to one teaspoon of salt in 8 ounces of warm water. Stir until the salt dissolves completely. Rinse your mouth gently for 30 seconds, then spit out the solution. The salt helps reduce inflammation and may inhibit bacterial growth. Research in the International Journal of Dental Hygiene supports saltwater rinses as an effective, low-cost treatment option. You can repeat this rinse 2 to 3 times daily, particularly after meals.

Baking soda rinses offer another option. Mix one-half teaspoon of baking soda in 8 ounces of warm water and rinse similarly to saltwater rinses. Baking soda is alkaline and may help neutralize acidic environments in your mouth that can worsen ulcer pain. Some people find this gentler than salt if their ulcers are particularly sensitive.

Hydrogen peroxide solutions can also be used, though with caution. Mix one part 3% hydrogen peroxide with one part water. Use this rinse 2 to 3 times daily for 30 to 60 seconds. Hydrogen peroxide can help cleanse the wound and may have mild antimicrobial properties. However, do not swallow this solution, and avoid using full-strength hydrogen peroxide as it can damage mouth tissues.

For additional soothing relief, some people use chamomile tea rinses. Brew a cup of chamomile tea, let it cool, and use it as a rinse 2 to 3 times daily. Chamomile contains compounds that may reduce inflammation and promote healing.

Practical Takeaway: Start with saltwater rinses as your first home treatment—they are inexpensive, safe, and supported by research. Perform rinses after meals and before bed. Avoid rinsing vigorously; gentle swishing is sufficient and less likely to irritate the ulcer further.

Topical Treatments and Natural Remedies

Beyond rinsing, applying topical treatments directly to the ulcer can reduce pain and potentially speed healing. Many effective options are available without visiting a healthcare provider. Over-the-counter topical products and natural remedies can be applied directly to the sore to create a protective barrier and deliver soothing or healing compounds.

Topical anesthetics containing benzocaine or hydrogen peroxide are available in most pharmacies without a prescription. Products like Orajel or Kanka create a numbing effect that can provide relief for 15 to 30 minutes, making it easier to eat or drink. Apply these products directly to the ulcer according to package directions, typically 2 to 4 times daily. While these do not accelerate healing, they manage pain effectively during the recovery period.

Honey has demonstrated antimicrobial and anti-inflammatory properties in clinical studies. Research published in the Journal of Oral and Maxillofacial Pathology found that raw honey applied directly to mouth ulcers reduced pain and accelerated healing compared to no treatment. Apply a small amount of raw honey directly to the ulcer 3 to 4 times daily. Honey creates a protective barrier and may inhibit bacterial growth.

Milk of magnesia, traditionally used for digestive issues, can be applied topically to mouth ulcers. Dab it directly onto the sore using a cotton swab 3 to 4 times daily. The alkaline nature may provide relief and create a protective coating. Some people combine milk of magnesia with diphenhydramine liquid (the active ingredient in allergy medicines) in equal parts for enhanced numbing and protective effects.

Coconut oil has become popular in recent years. The lauric acid in coconut oil has antimicrobial properties. Apply virgin coconut oil directly to the ulcer several times daily. While more research is needed compared to honey or salt rinses, many people report symptom improvement.

Avoiding foods and beverages that irritate the ulcer is equally important. Hot foods, spicy items, citrus fruits, tomatoes, and acidic drinks can intensify pain. Similarly, rough-textured foods like chips or hard candies may physically irritate the sore.

Practical Takeaway: Try honey as your first topical treatment—it is inexpensive, food-grade, and has research support. Apply it after meals and before bed. Avoid aggressive brushing near the ulcer, and consider using a soft-bristled toothbrush to prevent further injury.

Dietary Adjustments and Nutritional Support

What you eat significantly impacts mouth ulcer development and healing. Nutritional deficiencies are a documented cause of recurrent mouth ulcers, so adjusting your diet can both prevent future ulcers and support faster healing of current ones. A study in the Oral Surgery, Oral Medicine, and Oral Pathology journal found that patients with recurrent aphthous ulcers had significantly lower levels of iron, B12, and folate compared to those without ulcer history.

Certain foods are known to trigger or worsen mouth ulcers. These include citrus fruits (oranges, lemons, grapefruit), tomatoes and tomato-based products, pineapple, kiwi, strawberries, and other acidic foods. Spicy foods irritate ulcers by triggering inflammation. Hard, sharp, or rough-textured foods like chips, popcorn, hard candy, and crusty bread can physically damage the ulcer tissue. Sodium lauryl sulfate in some toothpastes causes problems for some people, but more importantly, certain mouthwashes can irritate existing ulcers. During the active ulcer phase, avoiding these triggers reduces pain and allows better nutrition intake.

To support healing, increase your intake of foods rich in B vitamins, particularly B