Charak Samhita
दन्तान् खादति यो जाग्रदसाम्ना विरुदन् हसन्। विजानाति न चेद्दुःखं न स रोगाद्विमुच्यते ॥१९॥
The patient who gnashes teeth while awake, cries and laughs loudly and does not have the pain sensation, does not recover from the disease.
english translation
dantAn khAdati yo jAgradasAmnA virudan hasan। vijAnAti na cedduHkhaM na sa rogAdvimucyate ॥19॥
hk transliteration by Sanscript