Charak Samhita
दन्तहर्षान्मुखास्रावात् स्वेदनान्मुखबोधनात्। विदाहाच्चास्यकण्ठस्य प्राश्यैवाम्लं रसं वदेत् ॥७५॥
If, after putting in mouth, the teeth become sensitive, or if there is salivation, sweating, gustatory sensations and burning in mouth and throat, that should be labelled as amla rasa.
english translation
dantaharSAnmukhAsrAvAt svedanAnmukhabodhanAt। vidAhAccAsyakaNThasya prAzyaivAmlaM rasaM vadet ॥75॥
hk transliteration by Sanscript