Multani mitti (calcium bentonite), also known as Fuller's earth, is a mineral-rich clay commonly used in homemade face packs. It contains a lot of magnesium chloride. It cleanses your skin thoroughly, removes whiteheads and blackheads, and reduces pore size. Multani mitti, on the other hand, can be just as harmful. In this article, we've covered everything you need to know about Multani mitti, as well as some quick and easy ways to apply it to your face.