During winter one can experience split ends and dryness occurs due to the cold or any chemical hair treatments. On the other hand, greasy hair might become greasier due to the lover levels of grease or hormonal changes. In such cases we can mix virgin oil with a few drops of lemon if the grease is not excessive. For the dry and damaged, dull hair which has lost its oil balance, we can use avocado oil on its own because it will help the hair get the grease it needs. Also we can use Melissa or centaury oils on their own on the hair roots by massaging the roots. If we want to enjoy the benefits of all oils, then we can mix concentrated castor, jojoba, argan, and oregano oils with olive oil.