Spearmint essential oil is excellent natural remedies for sinus, tension and hormonal headaches. Spearmint essential oil can be used to great effect on your hair and your scalp. Because of its anti-fungal and antibacterial nature, it is an effective treatment for scalp conditions like dandruff as well as being effective against lice. Its cooling menthol content also makes it an excellent remedy for itching and dryness. It is also great for skin and nails, muscle pain, circulation and wounds and cuts.