Using Advair diskus, a patient may or may not taste or feel the powder delivered by the diskus. After each use or each dose, it is advised to rinse the mouth with water then spit the water out and never to swallow it. Perhaps missing out on these proper instruction on the use of the diskus is causing the strong after-taste. If rinsing the mouth is followed and still experiencing a strong after taste, it is best to consult and notify the physician about it.