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Published 12:14 19 May 2018 BST
Updated 17:44 19 May 2018 BST

"Because of this, your shampoo may not work as effectively over time. A shampoo's effectiveness can also be attributed to your hair texture and scalp—whether it is oily or dry—and the weather" said Mezei.
Celebrity hair stylist Danny Jeleca sings off the same hymn sheet and says that switching shampoo helps to clear product build-up.
If you love your shampoo too much to switch, Danny recommends using a clarifying shampoo (baking soda also works a treat) once a week to properly cleanse your hair.
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