Astanga Hrudaya
कषायो जडयेज्जिह्वां कण्ठस्रोतोविबन्धकृत्। रसानामिति रूपाणिकर्माणिमधुरो रसः॥६॥
Kashaya (astringent): Kashaya (astringent) inactivates the tongue (diminishes capacity of taste perception) and causes obstructions of the passage in the throat.
english translation