This mask revitalizes dull-looking hair by adding moisture and oils for shine. Here's what you'll need: 1 medium avocado, 1/4 cup olive oil, i tbsp lemon juice, 2 to 4 egg yolks. Mash the avocado in a medium-sized bowl, then add olive oil, lemon juice and egg yolks. Stir into paste. Work evenly into hair, then pin hair up and cover with cap or plastic. Let stand for 30 minutes, then rinse with mild shampoo or cleansing conditioner.