Apparently, using a toothpaste which foams a lot could create canker sores. That has to do with some chemical agent in the foam that the paste whips up. It can erode the soft gums at the root of the teeth... Aw... we know so little about our `hygiene products'! Toothpase that contain some sulphate thingie SLS (Sodium lauryl sulphate) are mostly dubbed the culprit.
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