Using an essential oil as a part of your daily routine will not only treat dandruff, but will also give you healthy hair. Lemon oil, basil oil and tea tree oil are some of the oils that you can add to bid adieu to scalp issues, says an expert. lists some essential oils for better results: Lemon oil: Enriched with the goodness of lemon and due to its clarifying properties, this oil is a wonder tonic for people with oily scalps. Besides being an antiseptic and anti-microbial, which helps fight dandruff and other secondary infections, lemon oil also renders a pleasant and long-lasting healthy fragrance to the hair. The only factor to keep in mind is that after having used this oil, one must thoroughly rinse it off before stepping into direct sunlight, since citrus is known to react to sunlight.