Rinse your mouth often when you have a canker sore, preferably with a mouthwash that has antiseptic properties. This will reduce the chance of infection and will also numb the pain. A mixture of a teaspoon of salt in a cup of water is a suitable alternative to store-bought options. If you have a lot of canker sores, your doctor may prescribe a rinse with a steroid that reduces inflammation or lidocaine to numb the area.
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