Very good question, and thank you for asking it. Masks are really there to reinforce and boost the effects you’re trying to achieve with your home care routine. So my advice is this; pin point what your main concern is on your skin, and pick a mask that is going to help you deal with that issue. For example, if hydration in the skin is poor, then pick a hydrating mask. If you suffer with congestion and oiliness, choose a clarifying mask or an absorbing clay mask. If your main concern is aging or pre-mature ageing then you need a mask containing growth factors and DMAE and Anti-oxidants and ingredients like that. A mask can be done on a weekly basis.