This has to be the best and cheapest mask I have ever tried! It contains both AHA and BHA and aids in skin renewal process, revealing soft and youthful skin. My skin instantly feels softer and smoother whenever I use it. I do experience a mild tingling sensation when I first apply but the sensation subsides after a few minutes. If you have sensitive skin, this mask may be too strong for you as when I apply it, the fumes sting my eyes a little. Overall, this is a fantastic mask and I will keep using this for many years to come :)