I can’t explain it so won’t try. But if you have trouble with them, you might benefit from using toothpaste that doesn’t have Sodium lauryl sulfate as an ingredient. I’ve always been prone to them, and they suck because saliva is acidic and makes it hard to heal open sores. After reading about SLS I changed toothpaste and the frequency went from one every 3-4 weeks to maybe one a year. It was a really dramatic drop.
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