What is this and what is it used for? (Picture Included)

Question

http://www.rivoliortho.com/images/Rivoli-096_32.jpg

Answer 1

That looks to me like a bite guard, meant to be worn at night to keep you from grinding your teeth.

Answer 2

New age condom.

Scary, right?

Answer 3

looks like a retainer to me, for people who have had braces and want to keep their teeth straight

Answer 4

It's called a lower posterior bite block. It's to help people with an open bite.(someone who's teeth don't overlap when they bite down). It helps the front teeth close together more. It's worn 24/7 except to eat,brush and if you play a contact sport where a mouth guard should be worn.

I take it you're from Rochester NY.