When applied twice daily for 45 days, tea tree oil reduces several acne symptoms, including acne severity. Fungus infections of the nails (onychomycosis). Topical application of 100% tea tree oil solution, twice daily for six months, can cure fungal toenail infection in about 18% of people who try it.
vital adjective (IMPORTANT) B2 necessary for the success or continued existence of something; extremely important: A strong opposition is vital to a healthy democracy. She had found out some information of vital importance. The kidney plays a vital role/part in the removal of waste products from the blood.
essential refers to something that is part of the basic nature or character of a thing and is vital to its existence or functioning: Water is essential to life. necessary 1. used with an infinitive If it is necessary to do a particular thing, that thing must be done. It is necessary to act fast. It is necessary to examine the patient carefully. 2. used with 'for' You can say that it is necessary for someone to do something. It was necessary for me to keep active and not think about Sally.