My father has Obstructive Sleep Apnea and will be going in for a sleep study soon so I am looking at CPAP Machines and doing research.

My father came across an add for this "Oral Appliance Therapy" thing and I am wondering if you have any info on if it works or if it is a scam.

Oral Appliance Therapy

http://www.tiredofcpap.com/

I’m looking at the CPAP Machines and if you could share your stories with me, I would greatly appreciate it!
Obstructive Sleep Apnea Info:

http://en.wikipedia.org/wiki/Obstructive_Sleep_Apnea