Well many people are arguing about how to wear masks and whether to wear them once or reuse them many times. It's simple, science behind this is clear, it is NOT RECOMMENDED to wear a mask more than once!

First of all you should check whether you have damaged your mask, if your mask has any kind of hole in it, it is obviously useless. Although everyone is panicking about masks, they aren't that essential for ordinary people that just use them when going out for shopping groceries. Masks are more to be used by health workers, people who sneeze/cough and those who are in constant contact with people. And you should not wear a mask more than once, or at least not more than 8 hours.