A drop or two can also be used on handkerchiefs, tea tree oil is good as protection against infections during a journey, I usually keep an handkerchief with a couple of drops at hand when I fly or go in very busy public places, where it's easier to catch something.
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My mother uses a drop of lavander oil applied under her nose to stay off headaches, and it works!
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If there is an essential oil you particularly like you can rub in a few drops on the surface of a wooden table or chair, applying it with a soft cloth. It keeps the wood looking good and you get to enjoy it too!
Pour 3-4 drops of essential oil in the water when you run a bath to enjoy a super treat.....
For essential oils and their connections to the chakras, see this post http://www.MysticBoard.com/viewtopic.php?t=2381