I have had central and obstructive sleep apnea for as long as I can remember. I am on my fourth oral appliance. I went for my one month follow up this morning. I must say that Dr. Cohen and her team have been extremely meticulous and my appliance is very comfortable and seems to be helping tremendously. They take precise measurements and make the according adjustments instead of just filling your mouth with plaster and telling you to bite down. The Dr. has been a miracle worker thus far!