A reader wrote in this week: “Is magnesium good for canker sores?”
Yes. But if magnesium is the only thing you change, you’ll probably be disappointed, because for most people the real trigger is sitting on the bathroom counter: their toothpaste.
Most toothpaste foams because of a detergent called sodium lauryl sulfate, or SLS, the same class of molecule as dish soap. (The cleaner I used on my garage floor for years was 50% SLS.)That foam isn’t cleaning anything. It’s stripping away the thin, slippery mucin layer that protects the tender tissue inside your cheeks and lips, and once that...
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