To heal a canker sore, which typically resolves on its own within 1 to 2 weeks, you can use several home remedies and over-the-counter (OTC) treatments to relieve pain and speed healing:
Home Remedies
- Saltwater rinse: Dissolve 1 teaspoon of salt in 1/2 cup warm water, swish for 15-30 seconds, then spit out. Repeat several times a day to help dry out the sore
- Baking soda rinse: Mix 1 teaspoon baking soda in 1/2 cup water, swish for 15-30 seconds, then spit out. Repeat as needed to reduce inflammation
- Hydrogen peroxide: Dilute 3% hydrogen peroxide with equal parts water, apply directly to the sore with a cotton swab or use as a mouth rinse to clean and reduce bacteria
- Milk of magnesia: Dab a small amount on the sore up to three times daily to neutralize acid, coat the sore, and relieve irritation
- Coconut oil: Apply generously several times daily for its antimicrobial and anti-inflammatory effects
- Chamomile compress: Apply a wet chamomile tea bag to soothe pain and inflammation
- Other natural options: Sage rinse, echinacea mouth rinse, zinc lozenges, and vitamin B complex supplements may support healing and immune function
OTC Treatments
- Topical anesthetics: Gels or creams containing lidocaine can reduce pain and inflammation
- Anti-inflammatory medications: Corticosteroid gels or mouth rinses can help reduce pain and promote healing, especially for severe sores. Prescription options include topical steroids or oral steroids like prednisone for major ulcers
- Mouthwashes: Chlorhexidine-containing rinses help prevent infection and inflammation; avoid alcohol-based mouthwashes as they can irritate sores
When to Seek Medical Help
- If a canker sore lasts longer than 2-3 weeks, is unusually large or painful, or is accompanied by other symptoms, consult a healthcare provider
In summary, most canker sores heal without treatment, but using saltwater or baking soda rinses, hydrogen peroxide, milk of magnesia, and OTC pain- relieving gels can ease discomfort and promote faster healing
. For severe or persistent sores, medical treatments including corticosteroids may be necessary
