Tea Tree oil is likened to a medicine cabinet in a bottle and is, in fact, one of the most beneficial of all essential oils to have in your home. Tea Tree oil should not be consumed orally; instead, it is beneficial in treating the likes of eczema, athlete's foot, nail fungus, cold sores, insect bites and much more. A few drops in a spray can create a marvellous disinfectant that works well on counter tops.