Sometimes the muscles in charge of keeping the air passages open, relax during sleep, obstructing the passage of air through the pharynx and producing vibration in the soft tissues. This process is responsible for what we commonly call snoring. The lack of airflow often brings about a drop in blood oxygen levels which alerts the brain, producing numerous sleep interruptions during the night. This drop brings about a series of symptoms such as hyper somnolence, memory loss, and mood changes that affect personal and professional life, not to mention the risk of an accident on the job or road when the patient falls asleep while driving. In general, this oxygen deficiency increases the risk of a number of diseases such as hypertension, heart attack, stroke, and thromboembolism. Orthodontic and pneumology research have demonstrated that, in certain cases, this pathology can be improved by mandibular advancement devices (MAD) which increase the permeability of the airways.