Nature can heal it: A painful mouth sore on a place inside the mouth, is called a canker sore or an aphthous ulcer. There is medicine to put on it for pain and inflammation, but the medicine doesn't heal it up faster. Some medicines need a prescription; some are otc. It may take 5-7 days to heal. A doctor should check if there are many or repeated ulcers, or possible sexually transmitted diseases.
Answered 12/9/2013
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Zilactin B: A good economical fix is to go to your local pharmacy an buy a product called zilactin. Dry the ulcer with cotton tip applicator the apply a small pea sized drop of the gel. Wait until the gel becomes opaque. Plain zilactin stings. Zilactin recognized this and added Benzocaine to their product. The mixture is called zilactin b. You might have a vitamin deficiency. Check with your primary care.
Answered 6/24/2014
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