It depends on your anatomy and your level of sleep apnea. If the source of your sleep apnea/snoring is mainly from your tongue, then oral appliances are a good option. Also, it's been shown that oral appliances work better in people with mild to moderate sleep apnea, and less well in people with severe sleep apnea. One important thing to realize is that if your nose is stuffy at all, you should take care of this before even trying dental devices or even CPAP.