If your hair is dry, it is likely to become frizzy. To rehydrate it, apply a few drops of serum like the Bio-T Miracle Elixir Oil, $49 (96ml), on hair before brushing. This superlightweight serum is made with silk protein to help moisture bind to hair, boost volume and improve manageability. It also contains precious argan oil to repair, smooth and strengthen hair cuticles. It’s available at Venus Beauty outlets.