The Bottom Line
If you notice greenish, bluish, gray, or fuzzy spots on your bread, they are most likely mold.
Although it may seem wasteful to throw away an entire loaf, food safety guidance recommends discarding the whole loaf rather than simply cutting away the visible mold, because invisible mold growth may have spread throughout the soft bread.
When in doubt, it’s always better to replace a loaf of bread than risk serving spoiled food to your family.
A fresh loaf costs far less than the potential consequences of eating food that may no longer be safe.