Sometimes we get oil build-up on our skin. Clays are known to help with drawing out extra oils and toxins. After using a clay mask my skin feels good. Note: clay masks should not be used more than twice a week. I would even suggest no more than once a week. More often than that and too much oil is pulled from you skin causing it to produce more, essentially worsening the problem you used the mask for in the first place. Proper balance is key.