Do an oil bath before shampooing: - Castor oil , Argan oil , shea butter for very damaged hair In addition to your hair mask, add: - Jojoba oil For daily application to your lengths and ends , use light oils that are also suitable for oily hair: avocado oil and coconut oil . These treatments can be combined with essential oils, which are very good for the hair: Clary Sage Essential Oil Rosewood essential oil Ylang Ylang essential oil Grapefruit essential oil Essential oils should be used sparingly, one to two drops are enough.