Dr Shapira has been treating Sleep Apnea with oral appliances since 1982. He is the leading provider of DNA and MRNA Appliances in the Midwest, especially Illinois, Indiana, Michigan, Wisconsin, Iowa and Minnesota.
This is a link to Reddit which has patient Testimonials on the DNA and MRNA Appliances. https://www.reddit.com/r/DNAAppliance/
The following is a video on the announcement of FDA Approval and science behind it.
https://www.youtube.com/watch?v=qfzqR2Evpb0