Peppermint essential oil is said to be good for ailments like asthma, colic, fever, flatulence, headache, nausea, chest congestion and vertigo. This oil is supposed to be excellent for mental fatigue and depression, refreshing and stimulating with its menthol content. It is good for the skin and is used in lotions to treat sunburn, itchiness or inflamed skin. It helps fight bad breath and gum infections when used in mouthwashes. When used in an oil burner it is not only therapeutic it also keeps away mosquitoes and other insects.