There’s some truth to it.
Not everybody’s mouth is the same, and not all mouthwashes are the same.
I’m susceptible to gingivitis and gingival recession – literally, my gums slowly retreating away from my teeth in response to bacterial and chemical onslaughts. My dentist and periodontist tell me that adding alcohol-free mouthwash to my daily brushing and flossing helps wipe out more bacteria than brushing&flossing alone, which helps keep my gums healthy. On the other hand, an alcohol-based mouthwash would be too harsh and irritate my gums and dry my mouth out, which would be bad in their own ways.
For someone without my predispositions, using alcohol-based mouthwash daily might be less harmful or perfectly fine.
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