How do i know exactly what is a dental dam and does it work?

A rubber barrier: A dental dam is a square piece of thin rubber that stretches over the teeth you are having treated. This creates a barrier between your teeth and your mouth. This is critical with bonded dentistry, such as tooth colored fillings, so all moisture can be controlled also when removing old silver fillings you eliminate the risk of the patient accidentally swallowing anything. Absolute must!

Oral barrier: They are small thin pieces of latex (or other materials) that fit around tooth/teeth while the dentist is working. It enhances visibility when working, prevents saliva from seeping into the working field, and prevents aspiration of dental dental materials and tools.