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It's a fallacy. Onions don't actually "cause" bad-breath as such, but due to their high sulphur content the smell from them tends to linger after you've eaten them, until they've gone through your stomach. True "bad-breath" is usually caused by stomach upsets, colds and mouth infections. The biggets cause of bad-breath is from a build-up of food and plaque still left on the teeth due to improper brushing. The food remnants begin to rot in between the teeth because the mouth is moist and warm and this causes a nasty smell!

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16y ago

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