Our expert says:
You may have aphthous ulcers, flat very painful ulcers on the inside of the mouth and gums. THey are not sure what it is caused by, but viral infections, low immunity and certain chemicals may play a role. See http://www.medicinenet.com/canker_sores/article.htm
Check if your toothpaste contains sodium lauryl sulphate - this is very irritating to the mouth.
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