The leaves and bark of the Australian melaleuca tree produce tea tree oil, which is a powerful anti-bacterial, anti-fungal topical treatment. If you suffer with dandruff, head lice or a dry scalp, add drops of tea tree oil to shampoo to improve or eliminate your symptoms.
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Use an unopened bottle of shampoo so you know how much you have in the bottle. If you use an opened bottle, use a glass measuring cup to gauge the remnant.
Mix 10 drops of tea tree oil to every 8 ounces of shampoo. If you have 16 ounces of shampoo, add 20 drops of tea tree oil. If you have 4 ounces of shampoo, add 5 drops of tea tree oil.
Pour the mixture back into the shampoo bottle.
Shake the shampoo bottle contents vigorously to distribute the tea tree oil evenly.