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.
White pizza or pizza bianca is a type of pizza which uses no tomato sauce. In Rome, bianca or white pizza is a bread drizzled with olive oil. Feel free to experiment using anything, but my favorite way is to top it with mushrooms, black olives, and pepperoni.