June 18, 2026 Author : Gabriela Soares Vieira (dentistry ) Mandibular advancement device is a custom-made intraoral appliance, meaning it is designed and manufactured specifically for each individual . Although these devices have existed for several decades, their use has been increasing, mainly due to their portability and ease of use. They are used at night with the aim of keeping the airway open by: Gently advancing the lower jaw (mandible); Preventing the collapse of the tongue and the soft tissues of the pharynx. When might it be indicated? In general, a MAD may be indicated for people with: Mild, or in some cases moderate, sleep apnea; Primary snoring (snoring without associated apnea); Intolerance or poor previous adaptation to CPAP (continuous positive airway pressure). Does a MAD have advantages over CPAP? Yes. The mandibular advancement device offers important advantages , particularly in terms of convenience: Portable : it can be carried in a small case, making it ideal for frequent travelers. Comfort : it is generally more comfortable to use than CPAP. Discreet : it is silent and barely visible. Ease of adaptation : adaptation is usually faster than with CPAP, although adjustments may be needed during the first few weeks. Does a MAD have side effects? In general, people who are candidates for a MAD adapt well. When side effects occur, they are usually mild and temporary : Jaw pain or stiffness during initial use; Discomfort in the temporomandibular joint (TMJ); Tooth sensitivity; Excessive salivation or xerostomia (dry mouth); Occlusal changes, generally associated with improper adjustment or non-adherence to follow-up care. What are the current recommendations? International guidelines state that a MAD should: Be custom-made for each individual; Be prescribed and monitored by a dentist with training in dental sleep medicine; Have its effectiveness confirmed by a follow-up sleep study after appliance titration (gradual advancement). Meet the dentistry clinical team from Hospital da Luz network. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.
