The usefulness of tea tree oil is nothing new, and this Earth's Nectar Jojoba and Tea Tree Scalp Oil ($19) uses that ingredient to tackle dandruff or other bacteria that may be forming on your scalp and help it heal and stay flake-free. This moisturiser also adds in jojoba oil for added hydration and can be massaged into your head to increase circulation before leaving it on to deep condition under a hot towel.