Keep leftover Authentic Neapolitan Pizza Recipe (Classic Homemade Napoli Style) slices in an airtight container in the fridge for up to 3 days. If you want to freeze them, wrap each slice tightly and store them for up to 2 months. Add parchment paper between the slices so they don’t stick together while they’re stored. To reheat, bake the slices at 375°F for 6 to 8 minutes until the cheese melts again and the crust becomes firm. I don’t recommend using the microwave because it can make the crust soft and chewy. Throw the pizza away if you notice any sour smells, mold spots, or unusual moisture on the surface.