Oral appliances may be beneficial for mild to moderate obstructive sleep apnea. However, their efficacy in terms of controlling sleep apnea is less than CPAP. Further, only way to make sure if the oral appliance is working for you or not is to have a sleep study after you have an oral appliance fitted/implanted. These appliances should be customised to each individual as the oral anatomy of each of us is different. Please speak with local physicians specializing in sleep apnea to find the names of dentists who might be able to make one for you.