1 An older antibiotic, but still in use, and effective where you might be allergic to the penicillins. However, it may cause various types of stomach upset, and so is usually kept in reserve.  Clindamycin is the 500lb. gorilla of tooth abscess antibiotics used in dentistry.
A communicable disease is an illness transmitted through contact with microorganisms. People, animals, food, surfaces, and air can all be carriers of the microorganisms that pass infectious illnesses from one host to the next.
The commutative property is one of several properties in math that allow us to evaluate expressions or compute mental math in a quicker, easier way. This is a well known number property that is used very often in math. This property was first given it's name by a Frenchman named Francois Servois in 1814.