Reportage at the Lyon-Nord Rillieux polyclinic with an ENT (Ears, Nose & Throat) and Head and Neck surgery specialist. Consultation with a patient showing symptoms of sleep apnea. The ENT specialist presents various mandibular advancement braces (thermosettable or made-to-measure) to treat sleep apnea. The device is placed in the mouth to advance the lower jaw and tongue, which mechanically frees the airway in the throat.