This is not dangerous—merely disgusting to eat plain, especially given any expectation of the soft feel of bakery-fresh! But don’t throw it away!
You can bring stale bread back to life in a few ways:
Heat it: Put it in the oven for a few minutes (350°F or around 175°C) wrapped in foil, and it will rehydrate the insides of the bread.
Toast it: Stale bread actually makes for great toast, since it crisps exceptionally well. Repurpose it: More on that in a second—but stale bread can be a goldmine for cooking.
Now, if you’re thinking of eating stale bread as is, with perhaps a touch of butter or jam, you might be let down. But if you’re up for it, there