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EASE (endoscopically-assisted surgical expansion) is an operation which improves obstructive sleep apnea (OSA). The rationale of the surgery is based on the findings that patients with OSA often have narrow jaws, which result in constricted nasal airways and back of the tongue shift resulting in airway obstruction. By widening the upper and lower jaws, the surgery expands the nasal area and the palate. It stiffens the soft palate, and thus creates more space.