How to use tea tree oil: For occasional skin irritations- apply 1-2 drops of Tea Tree essential oil to the affected area. For additional cleansing properties, combine 1-2 drops with your facial cleanser or apply to skin after shaving. What does tea tree oil do: Apply it to your fingernails and toenails after showering to purify the nails and keep them looking healthy. Add a few drops to a spray bottle with water and use as a cleanser and purifier on surfaces. Tea tree oil benefits: Add a few drops of Tea Tree Oil to your shampoo to help moisturize the scalp – preventing itching or flaking and for smoother experiences.