My nana taught me when I was growing up that if you have a canker sore in your mouth swish a little peroxide around. (Do NOT swallow) Swish it around for anywhere from 30 seconds to a Minute & a Half, depending on how long you can tolerate it cause it is nasty tasting, But, believe me it helps tons, and is really worth it sometimes!!! Do it a few times a day maybe 2 or 3 and it will be gone in no time!! I've did it for years & now help my son do it when he needs!
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