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• This smooth layer then reflects the light, which is how serum gives your hair a shiny, not greasy, finish.
• Hair serums not only temporarily calm flyaways, frizziness and split ends, but they also help treat them so that your hair doesn't turn frizzy in the first place.
• Since frizziness is caused by a lack of moisture and natural oils, serums hydrate weak strands from the roots to the tips and lock the moisture in.