1. Rinse with cold water
Warm water causes hair to frizz. However, in order to loosen dirt and oils from the scalp and hair during a wash, you need it. The solution to quell the frizzing is to rinse conditioner out with cool water, as cool as you can stand. This tames the frizz and boosts shininess.
2. Leave some of your rinse-out conditioner
According to the Science of Black Hair, "If hair dryness and frizziness are major problems after shampooing and conditioning your hair, consider allowing a small amount of your "rinse-out" conditioner to remain in the hair after rinsing for additional control and sleekness.
3. Use a microfiber towel or a 100% cotton shirt to dry your wet hair
A regular towel ruffles up the hair fibres and causes the hair cuticle to lift and frizz. Microfiber is more absorbent than cotton.
4. Master your hair drying technique
Don't rub or ruffle the hair dry; either just tie your cotton shirt or microfiber towel around your head and let the water drip into the shirt or towel; alternatively squeeze gently down your partitions, if you twisted or plaited your hair for the wash.
Similarly, if you keep touching your hair you'll also encourage it to frizz. Lots of touching and rubbing causes frizziness because you tamper with the hair's cuticle layer.
5. Mix gel and serum
For more defined curls, mix a little gel with serum and scrunch (don't rub) this mixture down your hair by lightly squeezing. Gel, as always, helps to set the style and the serum smoothes the hair down thereby blocking atmospheric moisture from frizzing the hair.
6. Try Argan oil
Argan oil is reputed as being the best oil for tempering frizz.
7. Give the ends a little more TLC
Remember that the tips of your hair are older, weaker and therefore more prone to frizz. They need more moisture and (if possible) will perform better if they're not rubbing against clothing.
Finally, remember that some types of hair are just more frizzy than other types. If you try everything above and you still get frizz you'll just have to accept it and work with it!
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The Science of Black Hair, pages 78, 147-8