Canker sores are small white or gray sores with a red border that appear your lips, the back of your throat or under your tongue. Their exact cause is uncertain but some suggest that immune system problems, bacteria or viruses may be play a role. They are also more common in women.
Canker sores aren’t contagious and usually heal on their own after one or two weeks. Over-the-counter creams and mouthwashes may give you temporary relief. Until it heals, stay away from hot, spicy or acidic foods because these can irritate the sore.
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