Antiseptic and cleansing. Tea Tree provides a very powerful natural antiseptic and anti-fungal oil, which forms part of every qualified aromatherapist’s first aid and travel kit. During the cold season, a few drops used in the bath induces sweating. You can also use a few drops to make a gargle or mouthwash. The fragrance of organic Tea Tree is more rounded, herbaceous and less harsh than the conventionally cultivated variety.