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Damp hair is more susceptible to frizz, so air-drying is a no-no.

Use a blow dryer with a diffuser for even and sleek results.

By distributing hair's natural oils, boar bristle brushes have a smoothing effect.
Don't wash your hair every day. Doing so will strip it of its natural oils, which are key to keeping frizz at bay.
Dry, damaged hair is a recipe for a frizzy mess. Those with thick hair in particular should use a deep conditioner once or twice a week.
Always use sulfate-free products. The chemical roughens up the cuticle, creating frizz.
Serums seal the cuticle so humidity can't get in. It's best to stick to formulas without harsh silicones.