The act of moisturizing inherently means to add moisture. But, there is an ongoing belief that still exists to this day, that oiling your hair moisturizes it.
How?! Moisture or hydration at its core comes from water. If we think about it on a scientific level, oil and water do not mix. In fact, most of us learned in high school that if you were to take a glass right now and put equal parts of oil and water into it, they will not mix. So coating your hair with oils blocks said water from being able to enter the cuticle and moisturize the hair.
