An exfoliator is one of the key products that will improve your skin health at a much quicker rate due to the removal of dead skin cells and stimulation of healthy cellular growth. It will also benefit you greatly by imparting a immediate healthy glow. A mask (based on its formulation) will either offer addition nourishment, enhanced cellular stimulation or detoxification. When you feel that your skin needs a boost of some kind a mask would be the perfect choice.