YSK that SLS, an ingredient added to most commercial toothpastes, causes canker sores
Catsrules @ Catsrules @lemmy.ml Posts 3Comments 675Joined 2 yr. ago
Catsrules @ Catsrules @lemmy.ml
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I think you are thinking of cold sores not canker sores. Although I believe if you have HIV the odds of you getting canker sores increases.
As far as I know the exact cause of canker sores is unknown.