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.
Italian style cheeses such as Provolone, Scamorza, Mozzarella and Caciocavallo fall into a category of cheeses known as 'pasta filata' or 'stretched dough' cheeses. These cheeses undergo a specific and fascinating step whereby a finished ripened curd gets melted with hot salty water then stretched into various shapes.