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It’s well known that mold on cheese isn’t always something to worry about and sometimes it’s even to be enjoyed, but what about those times when a cheese should be thrown away? According to registered dietician Katherine Zeratsky on the Mayo Clinic’s website, soft cheeses like cream cheese, ricotta cheese and cottage cheese that have grown mold should be discarded. So should any type of cheese that’s crumbled, sliced, or shredded.

Hard and semisoft cheeses like Colby, cheddar, Parmesan and Swiss aren’t easily penetrated by mold, however, so you can cut away the moldy part and eat the rest. And of course cheeses like Camembert and Brie (and Gorgonzola—yum!), which mold is actually used to make, are completely safe to eat.

“If you’re not sure what type of cheese you have or what to do if it grows mold, the safe course is to discard it,” Zeratsky says.

Find out more about cheeses here.