MEDIHEAL M.E.N Timetox Black Mask EX.10 Masks - Sebum Control & Pore Purifying Black Charcoal Facial Mask Sheet, for Oily and Troubled Skin, Anti-Wrinkle, Moisturizing

Q: Can these be refrigerated for a more cooler effect?

yes, ony for few minutes like maybe less 10 mins. I never tried it because I want the room temperature.

Q: How many masks is it?

there are 10 sachets per box. i already bought 4x because it works with me. very easy to use

Q: How often can I wear these masks? Can I wear them each evening?

It would depend on your skin - dry yes. I found that using it in the am gave me a wonderful glow especially in this time of Zoom and WebEx. My skin is dry and dull so I use often but not everyday. I would if I had the time. Also, I use the mask on the top of my feet and hands after I use on my face.