I add a drop of the oil to my toothpaste before brushing. After brushing,, I get that clean fresh feeling that puts me in the best of moods. With continued usage twice a day, I find that the fresh feeling lasts throughout the day. If I missed out of using it then I tend to get more plague formation and that awful sticky feel in the mouth. This oil also does wonders for my digestive system. Just 4 drops under my tongue and wash it down with juice or water. I only get the initial stink during the first 2 weeks of use. Thereafter the oil no longer stinks me when applied under the tongue. It reduces the appearance of white coating on tongue and sometimes my tongue is a beautiful bright pink! I'll definitely continue to use it and recommend this oil to my friends.