How to prevent frizzy hair – and what treatments to use? From K18's game-changing Leave-In Molecular Repair loved by celebs like Selena Gomez and Hailey Bieber, to Olaplex's famed No. 8 hair mask

Both K18 and Olaplex have been hailed as game-changing products when it comes to targeting frizzy hair by stylists and consumers alike – but are there other ways to prevent it?

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