It is often stated that boric acid has the same toxicity as ordinary table salt in humans, which can be a little misleading. To understand what this means, it is important to understand a little bit about toxicology. In the medical field an objects toxicity is usually described as an LD50 value.
Mozzarella is the main type of cheese that is used on most pizzas. There are many different kinds of Mozzarella. Try to find a store that carries whole milk mozzarella. This is a nice creamy flavored mozzarella. It makes an excellent pizza.
Pizza is now a type of bread and tomato dish, often served with cheese. However, until the late nineteenth or early twentieth century, the dish was sweet, not savory, and earlier versions which were savory more resembled the flat breads now known as schiacciata.