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Published 17:00 21 Dec 2017 GMT
Updated 18:17 21 Dec 2017 GMT

According to the Livestrong website, Listerine was developed as a surgical antiseptic and used to clean wounds and treat fungal infections including dandruff. It was only in 1895 that it was suggested for oral hygiene use. If you don't fancy putting mouthwash on your head, Alopecia Ireland recommends applying vitamin E to the scalp or using apple cider vinegar as a rinse to treat dandruff.