Which works best for sleep apnea — and who are oral appliances really for? If you’ve been diagnosed with sleep apnea or troublesome snoring, you may have heard about mandibular advancement devices (MADs)  — often called oral appliances  or mouth guards for sleep apnea . They sound appealing. No mask. No tubing. No machine. But do they actually treat sleep apnea — or just snoring? Let’s break this down clearly and honestly, in patient-friendly terms. What Is a Mandibular Advan