Home Beauty If dry, frizzy hair is what plagues you, try this classic combo before dropping cash on the lastest pricey hair treatment. Simply mash an avocado with a few tablespoons of olive oil and apply to wet hair. Let sit for 15-20 minutes, then shampoo and condition as usual. The result: shiny, quenched locks from ingredients that you probably already had in your salad arsenal. Done and done!