Expiratory muscle strength is essential for optimal cough and swallows function. Strengthening of the expiratory muscles by regular application of the Breather can alleviate the symptoms of dysphagia by improving cough volume and acceleration, and reducing the risk of penetration and aspiration associated with dysphagia. Please see our website for further evidence: https://www.pnmedical.com/category/therapeutic-use/speech-swallow/