Citric acid naturally occurs in citrus fruit and is used in food as a preservative so it's not going to hurt you.
Your dentist may disagree - my father in-law (a dentist) wages a one-man war against fruit juice in all its forms. But then again, he has some pretty odd views on a lot of subjects.
@General_Strike started
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Citric acid naturally occurs in citrus fruit and is used in food as a preservative so it's not going to hurt you.