Mary Hart is Certified as a Holistic Wellness Coach and AromaTouch Technique Therapy + Pediatric Nurse. dTerra represents the Safest, Purest Essential Oils available in the World today. EO's Can be used three ways: Aroma/Topical/Internal. Each of the dTERRA CPTG Certified Pure Therapeutic Grade速 Essentials Oils is carefully extracted by a global network of skilled growers, distillers, & chemists ensuring a consistently powerful user experience.