Avocado can also be used to get thicker hair. Make a mixture of mashed avocado and banana and use it to massage your scalp. Leave the mixture on your hair for about half an hour so that the nutrients present in the mixture get absorbed by the scalp. You must wash your hair thoroughly with shampoo and apply a conditioner. Once your hair becomes dry it will look healthy and thicker. You can also make a hydrating hair mask at home by adding two tablespoons of olive oil to half a ripe mashed avocado. Apply this hair mask on freshly shampooed hair and allow it to sit for about twenty minutes. Finally rinse your hair thoroughly and apply some conditioner.