Oil has been used so commonly in our lives. Oil is used in many parts of our daily lives, such as food, cream, and skin moisturizer. Many of us do know about the risk of oil, but many of us do not know about which oil is the safest to use. Using high temperature thermometers and high temperature hot plate, we test out 6 of the common oils we use in our daily lives. As the chemical structure of the oil with the highest smoke point is the most stable, we can say that Avocado oil is the most stable oil, and is the safest for use, while Unrefined Sesame oil is the least stable oil, and would be much more dangerous than the other oils. This information is useful for the user of oils for cooking as it will help us to choose a diet that is healthier.