Astanga Hrudaya
लवणः स्यन्दयत्यास्यं कपोलगलदाहकृत्। तिक्तो विशदयत्यास्यं रसनं प्रतिहन्ति च॥४॥
Lavana (salt): Lavana (salt) causes more moisture in the mouth (increase salivation) and burning sensation in the cheeks and throat. Tikta (bitter): Tikta (bitter) cleanses the mouth and destroys the organs of taste (makes perception of other tastes impossible).
english translation