You will not find a permanent cure for those canker sores

Canker sores has border that are well defined and its center has a white or grey color. You can have 1 canker sore most of the time instead of multiple and most often they are found in the mouth and seldom on tongue. Usually, the canker sore becomes painful for 3 days or at most 4. When you don't get enough sleep or you are always stressed then you are more prone to having canker sores. Students don't get enough time to sleep during exams and they are prone to canker sores at this time. There

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