Brushing your teeth after eating sugary foods can damage your teeth and you should wait at least an hour after. For example, take this quote from a paper on "Sugar-Sweetened Beverages":

Brushing, immediately after consumption of SSB [Sugar-Sweetened Beverages] drinks should be avoided because the enamel becomes transition-ally softened. Patients should wait an hour before brushing to allow teeth to remineralize and enamel to harden.

However, does using a non-alcoholic fluoride mouthwash immediately after eating sugary/sweet foods also damage your teeth? I have found no references which address this subject.

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There are studies, e.g. The effect of chlorhexidine on dental calculus formation: an in vitro study, that have shown that using these mouthwashes increased the calculus formation (petrification of dental plaque biofilm).

I've received advice from dental hygienists to stop using mouthwashes for this very reason.

You would probably be better of rinsing your mouth with plain water. And brushing your teeth (after an hour) and flossing before using a mouthwash.

It is necessary to disrupt the biofilm prior to the start of a CHG mouthwash in order to reduce the side effects associated with this procedure

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