Essential oils are a great natural treatment to soothe and calm hair, and provide them luster. They are said to make them healthier, and can even aid their growth. Some aromatherapy essential oils are chamomile, eucalyptus, geranium, lavender, lemon, peppermint, rosemary, sandalwood, tea tree, ylang-ylang, bergamot, dill, fennel, and jasmine.